Extinction in Dog Behavior: Why Learned Behavior Disappears – and Returns

1. What Extinction Is

1.1 A Procedure, Not a Fading

Extinction is the procedure of no longer delivering the reinforcer that previously followed a behavior, with the result that the behavior declines in frequency, intensity, or duration.

It is not forgetting. Forgetting implies passive decay of a memory over time. Extinction is active learning: the dog acquires new information — that the previous contingency no longer holds. A dog that has stopped counter-surfing because the counter is now always empty has learned something new, not lost something old.

1.2 What the Dog Ends Up With

Bouton (2002) states the modern position: extinction does not destroy the original learning but produces new learning that is stored alongside it. The cue or action ends up with two available meanings, and which one governs behavior depends on what the current context retrieves — the same way an ambiguous word means different things in different settings.

This is why every subsequent section of this article exists. If extinction erased learning, relapse would need a separate explanation. Because extinction competes rather than deletes, relapse is the expected default whenever retrieval conditions favor the original memory (the same competitive-memory logic governs fear memories).

1.3 Extinction Is Something You Do, Not Something That Happens

The word is used two ways and the confusion is costly. As a procedure it means withholding the reinforcer that previously followed a behavior. As an outcome it means the behavior declining.

A behavior can decline for many reasons that are not extinction — satiation, illness, a change in the environment, a competing behavior — and running an extinction procedure does not guarantee the outcome (separating a procedure from its measured outcome). The distinction matters most when a behavior improves and nobody knows why, because the reason predicts whether it will last.

1.4 What Owners Usually Mean

Ignoring the behavior is the household version, and it is one narrow case of withholding a reinforcer rather than a general method: it is extinction only if the attention being withheld was actually the reinforcer, and many behaviors are maintained by consequences a person cannot withhold at all — the door opening, the other dog leaving, the food on the counter. Where a dog jumps because jumping produces contact rather than because it produces attention, ignoring changes nothing — the dog still reaches the person.

Identifying the reinforcer before withholding it is the step that decides whether any of this applies, and it is the step most often skipped (how reinforcement maintains behavior). It usually takes one careful observation and no equipment: watch what the dog gets immediately after the behavior, rather than what the household believes it is providing.

2. Inhibitory Learning, Not Erasure

2.1 What the Neuroscience Says

The circuit-level account is consistent and well characterized — in rodents. Extinction learning is associated with prefrontal regions, particularly the infralimbic cortex, which is thought to inhibit amygdala output rather than remove the original association. Extinction consolidation depends on NMDA receptor activation, and blocking those receptors prevents extinction while enhancing them pharmacologically can accelerate it (Quirk & Mueller, 2008; Milad & Quirk, 2012).

2.2 What That Means for Dogs

None of this has been measured in dogs. There is no canine work on infralimbic function during extinction, no receptor pharmacology of canine extinction learning, and no imaging of a dog forming an inhibitory memory. The mammalian conservation argument makes the extension reasonable; it does not make it evidence (the same caveat applies to frontal control claims generally).

What is worth taking from the neural literature is the qualitative point rather than the anatomy: extinction is an active, biologically costly learning process, not the absence of one. That has a practical consequence — anything that impairs learning impairs extinction specifically.

2.3 The Prediction-Error Link

Extinction is driven by negative prediction error: the reward fails to arrive when it was expected, and the value of the preceding cue or action is revised downward (Schultz, Dayan & Montague, 1997), a dip below baseline in the dopaminergic teaching signal (the neurochemistry of that signal). This is also why extinction is only effective when the dog actually notices the change — an animal that never expected reinforcement on this trial generates no error to learn from (the prediction-error mechanism in detail).

2.4 Why Erasure Would Be a Worse Design

A nervous system that deleted learned associations when they stopped paying would lose information that may become relevant again. Retaining the original association while adding an inhibitory one preserves both.

Read that way, relapse is not a flaw in extinction. It is the cost of a system built to handle environments that change back (why extinction stays tied to the context it happened in). A dog whose food bowl was moved for two weeks and then moved back has reason to retain the original association.

2.5 What the Dog Ends Up Knowing

After successful extinction the dog holds two associations about the same cue: it used to predict something, and in this context it currently does not. Which one governs behavior depends on the situation.

That is why the same dog can be reliably quiet at home and revert entirely at a friend's house, and why the household reads it as the training not having worked. The training did work; what it produced was context-bound, which is what extinction produces by default.

3. Why Context Decides Everything

3.1 Why Context Decides

Original conditioning often generalizes more broadly across settings than extinction learning does. This asymmetry is the defining property of extinction learning rather than an incidental complication (Bouton, 2002), and it is the single most useful thing a trainer can know about the process.

The canine demonstration is unusually clean. Hall (2017) reviews evidence that professionally trained explosives detection dogs whose searching went unreinforced along one route showed rapidly declining search performance on that route — while performance on a different route, where targets were still being found, remained intact. Extinction attached itself to the specific context in which it occurred and did not spread.

In everyday terms: a dog that has learned the doorbell no longer predicts anything in your hallway has learned that about your hallway. The inhibitory memory does not travel on its own (which is the same transfer problem that affects trained behavior generally).

3.2 Context Is Broader Than Location

Context includes the room, the time of day, who is present, what the dog was doing beforehand, the handler's state, and the dog's own internal condition. Any of them can serve as the boundary within which the inhibitory learning applies.

That breadth is why context work is harder than it sounds: a plan that varies the room while holding everything else constant has varied one dimension of several. Varying the handler is frequently the most informative change and the one households are least likely to try.

3.3 The Practical Consequence

Extinction achieved in one setting should be expected to hold in that setting. Anything beyond that has to be trained, and treating the first success as the finish line is the commonest reason households report that a problem came back. Renewal is not a relapse in the sense of something going wrong; it is what the learning predicts.

Planning for several contexts from the start costs little and prevents the conclusion that the dog has regressed. It also spreads the work over the period when the household is still motivated, rather than requiring a second effort after an apparent failure.

4. Extinction in Operant and Classical Learning

4.1 Operant Extinction

Withholding the reinforcer that previously followed a behavior. The dog jumps and receives no attention of any kind — no eye contact, no verbal response, no touch — and jumping declines. The dog surfs the counter and finds nothing, because the counter is now reliably empty.

Two side effects are commonly reported. Extinction-induced variability is the most useful: the dog tries other behaviors in an attempt to produce the old outcome, which creates opportunities to capture and reinforce an alternative. Extinction-induced frustration is the one to plan for, and it is more likely when reinforcement stops abruptly after a history of continuous reinforcement.

4.2 Classical Extinction

Presenting the conditioned stimulus without the unconditioned stimulus until the conditioned response declines. The clicker sounds and no food follows; the anticipatory response fades. A person who previously predicted something unpleasant appears repeatedly without anything unpleasant happening, and the fear response may decline.

The difference matters clinically. A classically conditioned response is not a voluntary behavior but an emotional and physiological reaction. Extinction of fear is slower, more context-bound, and considerably more prone to renewal than extinction of an operant response, and it is not a matter of the fear simply going away when nothing happens: what the treatment literature supports is a combination — extinction trials, counterconditioning that gives the trigger a new meaning, and the deliberate building of safety learning (Butler, Sargisson & Elliffe, 2011; Shnookal et al., 2024) (which is why reactivity needs the emotional layer addressed).

4.3 Why They Cannot Be Separated in Practice

The two run together. Ignoring a jumping dog is an operant procedure, but it also changes what visitors predict, which is classical. Reducing fear of a trigger through classical procedures reduces the operant avoidance that fear was driving.

The failure mode is specific and common: extinguishing an overt behavior without touching the emotional conditioning underneath produces a dog that complies and is still afraid.

4.4 Why the Distinction Blurs in a Household

Operant extinction removes the consequence; classical extinction removes the pairing. A household problem almost always involves both, because the situation that triggers the dog and the outcome the behavior produces are entangled.

A dog that lunges at another dog is responding to a trigger and producing a consequence — the other dog leaves. Withholding one does not address the other, and plans that treat the problem as purely operant routinely stall (changing what the trigger predicts through graduated counterconditioning). The distance the other dog keeps is not something the handler controls by ignoring anything.

4.5 Which One a Plan Is Actually Running

The test is what is being withheld. If the plan removes an outcome the dog produces, it is operant. If it presents the trigger without what used to follow it, it is classical. Asking that question of a plan takes a moment and frequently reveals that nobody had decided.

Most behavior plans do both without saying so, which is fine as long as nobody is surprised when the two components progress at different rates. The emotional component typically lags the behavioral one, which is why a dog can stop lunging while still finding the trigger unpleasant.

5. The Four Routes Back

Bouton (2002) treats all four as expressions of the same thing — retrieval competition between an intact excitatory memory and a context-bound inhibitory one — rather than as four separate mechanisms.

5.1 Spontaneous Recovery

The extinguished behavior reappears after a period without training, with no new reinforcement. The usual account is that the inhibitory memory becomes less accessible with elapsed time, letting the original briefly dominate. Longer intervals make recovery more likely, and successive recoveries are typically weaker and extinguish faster — a pattern worth recording rather than judging by impression.

Practically: expect it, do not punish it, and simply run the procedure again.

5.2 Renewal

The behavior returns because the context changed. The standard designations are worth stating correctly, because they are frequently garbled.

ABA renewal — learning in context A, extinction in context B, test back in A. Behavior returns. This is the most robust form.

ABC renewal — learning in A, extinction in B, test in a novel context C. Behavior returns, generally somewhat less strongly.

AAB renewal — learning and extinction both in A, test in a different context B. Behavior returns. This case is the important one for trainers, because it shows that simply leaving the context where extinction happened is enough to bring the behavior back — even when acquisition and extinction occurred in the same place.

5.3 Resurgence

The original extinguished behavior returns when a newer, reinforced replacement behavior is itself no longer reinforced. A dog taught to settle on a mat instead of counter-surfing will tend to return to counter-surfing if the mat behavior stops paying. This is the strongest argument for maintaining the replacement behavior indefinitely rather than assuming it has taken over.

5.4 Reinstatement

A single unpaired encounter with the original reinforcer restores the extinguished response. One guest who greets the jumping dog, one successful counter-surf after a visitor left food out, and the behavior is back — not because the dog has "learned that persistence works," but because the reinforcer itself has re-established the expectation.

5.5 Why Four Routes and Not One

The four are distinguished by what triggers the return: time alone, a change of context, the removal of an alternative behavior, or a single unsignaled encounter with the original reinforcer. They are not four names for the same thing, and a plan that anticipates only one of them is exposed to the other three.

Distinguishing them in a case history is diagnostic. A behavior that returned after a holiday is spontaneous recovery; one that returned at a new house is renewal; one that returned when the trained alternative stopped paying is resurgence; one that returned after a single successful repetition is reinstatement.

5.6 What Each Route Implies for the Plan

Spontaneous recovery calls for maintenance rather than repetition of the whole protocol. Renewal calls for context work. Resurgence calls for checking that the alternative behavior is still being reinforced. Reinstatement calls for management to prevent the encounter, since a single successful repetition can undo weeks.

Applying the wrong remedy is common and wastes weeks, which is the practical argument for the taxonomy. It also spares the household the conclusion that the plan failed, when what happened was a return with a known cause and a known answer.

6. What the Canine Work Shows

6.1 A Small but Real Species-Specific Base

Most of the extinction literature is rodent and human. Two lines of canine work bear directly on it, and they are worth separating from the theory they are usually presented alongside.

6.2 Persistence and Resistance to Extinction

Persistence and resistance to extinction have been examined in the domestic dog with both basic and applied questions in view (Hall, 2017). That work matters because resistance to extinction is the practically relevant quantity: not whether a behavior can be extinguished but how long it takes and what happens on the way.

Detection and working dog contexts are where this is most consequential, since a dog that gives up on an unrewarded search is a dog that stops working before the target appears. Most working searches are blank, which makes resistance to extinction a requirement of the job rather than a side effect.

6.3 Partial Reinforcement in a Training Context

Partial rewarding during clicker training has been examined in dogs (Cimarelli et al., 2021), which addresses a question handlers ask constantly and the theory answers only in the abstract.

The theoretical prediction is clear: intermittently reinforced behavior resists extinction longer than continuously reinforced behavior. Whether that helps or hurts depends entirely on whether the behavior is one you want. It also means the answer to "should I reward every time?" depends on what stage the training is at, and no single rule covers both acquisition and maintenance.

6.4 Why This Matters More Than the Neuroscience

A handler deciding how to reinforce a behavior is making a decision about how hard that behavior will be to remove later. That is a practical consequence of extinction theory, it applies to every training decision, and it does not require any account of what the amygdala is doing.

It also cuts in an uncomfortable direction: the reinforcement pattern that makes a wanted behavior durable is the same one that makes an unwanted behavior hard to remove, and a household reinforcing jumping only occasionally is building exactly that durability.

6.5 What Is Still Missing in Dogs

No canine study has demonstrated renewal, reinstatement or resurgence experimentally under controlled conditions, nor measured how long spontaneous recovery persists in this species. Those four routes are the organizing structure of this article. They are a learning model established in other species, and their strength and parameters in dogs are unknown — how readily each route occurs here may differ from the rodent case.

Clinical experience with dogs is entirely consistent with them, which is not the same as having tested them here. The framework is conserved across every species it has been tried in, so the extrapolation is safer than most in this collection — and it is still an extrapolation.

7. Bursts, Frustration, and What Actually Happens

7.1 Extinction Bursts Are Less Universal Than Assumed

The initial increase in behavior when reinforcement stops is usually presented as inevitable. It is not. Lerman and Iwata (1995) analyzed 113 sets of extinction data and found bursting in 24% of cases — and, critically, in 36% of cases where extinction was used alone against only 12% where it was combined with other procedures such as reinforcing an alternative behavior.

That dataset comes from applied behavior analysis with human participants, so the percentages should not be transferred to dogs literally. The direction is what matters: bursts are a minority outcome, and giving the animal an alternative that still pays roughly cuts their frequency.

7.2 The Emotional Cost

Unexpected non-reinforcement produces frustration. Dogs with low frustration tolerance may escalate, redirect, or disengage, and for these individuals extinction used alone is a poor tool regardless of how theoretically sound it is (the neurobiology of canine frustration in detail), and frustration tolerance itself varies with temperament (as the coping-style literature describes).

This is a welfare consideration and not only a technical one. A procedure that works but leaves the dog reliably frustrated has costs that belong in the decision.

7.3 Stress Impairs Extinction Specifically

Because extinction is new learning, anything that degrades learning degrades extinction. Chronic stress impairs prefrontal function in rodents, primates, and humans (Arnsten, 2009) — extrapolated to dogs, not measured in them — and the behavioral corollary is well supported: a dog carrying a high baseline stress load is a poor candidate for a procedure that depends on acquiring new inhibitory learning. Address the stress first (the full account of chronic stress in dogs).

7.4 What the Burst Claim Costs

Telling an owner that the behavior will get worse before it gets better sets them up to persist through a period that may not occur and, if it does, to interpret it as progress. Where the behavior escalates for other reasons — frustration, a different reinforcer taking over — the same framing keeps them going in the wrong direction.

The prevalence data suggest bursts are far from universal (Lerman & Iwata, 1995), and the honest instruction is to watch rather than to expect. Where an escalation does occur, the useful question is whether it is a burst or a different reinforcer taking over, and those call for opposite responses.

7.5 Why Stress Matters Specifically Here

Extinction learning depends on prefrontal function, and prefrontal function degrades under stress (Arnsten, 2009). That predicts something checkable: extinction should proceed poorly in a dog that is already under load, and better in one that is not.

For a plan, that means the household's circumstances are part of the intervention rather than background to it. Starting extinction work in a week the dog is already struggling is a reliable way to make it take longer.

8. What Makes Extinction Work — and When Not to Use It

8.1 The Reinforcement History Beforehand

Behavior maintained on an intermittent schedule is more resistant to extinction than behavior maintained on continuous reinforcement. This is the partial reinforcement extinction effect, and it is one of the most reliable findings in the operant literature.

The common training conclusion drawn from it — therefore train on variable schedules from the start — does not follow, and has been tested in dogs. Cimarelli et al. (2021) clicker-trained naïve dogs with either continuous reinforcement or reinforcement on 60% of clicks. Partial rewarding did not improve learning speed, and the partially rewarded dogs subsequently showed a more pessimistic bias in a cognitive bias test. Build with continuous reinforcement; introduce variability once the behavior is fluent.

8.2 Expectancy Violation

Craske et al. (2014), working on human exposure therapy, argue that the effective ingredient is not the disappearance of the response but the strength of the mismatch between what was expected and what occurred. Extinction trials work best when the change in contingency is unmistakable to the learner.

Applied to dogs, this means partial, hesitant, or inconsistent extinction is worse than no extinction: it teaches that reinforcement is sometimes absent, which is precisely the schedule that makes behavior harder to extinguish later. The framework is human and clinical, and its transfer to dog training is an extension rather than a finding.

8.3 Differential Reinforcement Is Not Optional

Combining extinction with reinforcement of an alternative, incompatible behavior does three things at once: it reduces the burst rate (Lerman & Iwata, 1995), it lowers frustration by giving the dog a route that still pays, and it builds the behavior you actually want rather than merely subtracting one you do not.

The caveat from §5.3 applies: keep reinforcing the replacement, at least intermittently, indefinitely.

8.4 Context Work — With a Caveat

The standard advice is to run extinction across multiple contexts to reduce renewal. It is reasonable and follows directly from the context-dependence of extinction. It is also less certain than usually presented: the evidence that multiple-context extinction reliably reduces relapse is mixed, and the conditions under which it helps are not settled (Bouton, 2004).

Practical reading: vary contexts, and do not treat having done so as proof against renewal. Plan for relapse either way.

8.5 When Extinction Is the Wrong Tool

Fear-based behavior, including fear-based aggression. Withholding reinforcement does not address the underlying emotional state and may worsen it, and fear does not reliably subside simply because nothing happens. The indicated approach is systematic desensitization and counterconditioning, which has controlled canine support (Butler, Sargisson & Elliffe, 2011; Shnookal et al., 2024) and treats the anxiety rather than its outward expression (the neurobiology of canine anxiety) (and the fallout of getting this wrong is well documented).

Separation-related behavior. Howling and destruction on departure are typically panic-driven rather than maintained by owner attention. Ignoring the dog on return does not treat panic (the neurobiology of separation-related distress).

Compulsive and self-reinforcing behavior. Tail chasing, flank sucking, chasing shadows, barking at echoes — where the behavior generates its own consequence, there is no external reinforcer to withhold. Hall (2017) notes that the reinforcement contingencies maintaining canine stereotypies are frequently not the ones owners assume.

Anything where the burst would be dangerous. If escalation carries bite risk, extinction alone is not an acceptable plan.

8.6 Why Differential Reinforcement Is the Whole Method

Extinction alone leaves the dog without a behavior that works, which is why it produces frustration and why the old behavior returns when nothing better is available. Reinforcing an alternative removes both problems.

Nearly every reported failure of extinction in practice is a case where the alternative was never established or stopped being reinforced. The second is the quieter of the two: a household reinforces the alternative diligently for three weeks and then stops, and the old behavior returns on schedule.

8.7 Extinction Is Not a Standalone Recommendation

Nothing in this literature supports advising a household to simply stop reinforcing a behavior and wait. That advice is common, it describes a procedure rather than a plan, and it is the version most likely to produce an escalation the household is unprepared for. It also puts the whole burden on the owner's consistency, which is the least reliable component of any behavior plan.

What the evidence supports is extinction as one component alongside management, an alternative behavior and context work. Presented on its own it is not a plan but a description of what the household should stop doing.

9. Which Findings Come From Which Species

9.1 The Split

This article rests on a theoretical framework built almost entirely outside this species, and on a small canine literature that concerns application rather than mechanism.

9.2 The Framework Is Rodent and Human

The account of extinction as inhibitory learning rather than erasure, and the four routes by which behavior returns, come from a research program conducted largely with rats (Bouton, 2002, 2004; Rescorla, 2001), and the circuit-level work behind it is rodent as well (Quirk & Mueller, 2008; Milad & Quirk, 2012). The exposure-therapy work that produced the expectancy-violation principle is human (Craske et al., 2014).

The foundational demonstrations are older still and equally not canine in the modern sense (Pavlov, 1927; Skinner, 1938), and the prediction-error account was recorded from primate neurons (Schultz, Dayan & Montague, 1997).

9.3 The Extinction Burst Evidence Is Human Applied Work

The finding that extinction bursts are far less universal than assumed comes from applied behavior analysis with human participants (Lerman & Iwata, 1995). It is one of the more useful corrections in this article and it was not obtained in dogs.

Whether canine extinction bursts occur at a comparable rate is unknown, and the claim circulating in dog training that they are inevitable has no source in either literature. It survives because it is memorable and because it explains away an early setback, which makes it unfalsifiable in practice: if the behavior worsens the burst was predicted, and if it does not, so much the better.

9.4 What Was Measured in Dogs

Persistence and resistance to extinction (Hall, 2017), partial reinforcement in clicker training (Cimarelli et al., 2021), systematic desensitization for a specific problem (Butler, Sargisson & Elliffe, 2011) and counterconditioning-based interventions in companion dogs (Shnookal et al., 2024).

Four canine sources, all applied, none addressing the mechanism. That distribution is typical of a field where the theory arrived from elsewhere and the canine work took it up as a tool rather than a question.

9.5 Why the Practical Advice Still Holds

The recommendations here — reinforce an alternative rather than relying on extinction alone, work across contexts, expect return after a gap, do not use extinction on fear-based behavior — follow from the framework and are supported independently by the canine applied work.

They would survive a substantial revision of the mechanistic account, which is the test that matters. If extinction turned out to work differently at the neural level, none of the four recommendations would change.

10. Extinction and Relapse at a Glance

Operant extinction — Procedure: withhold the reinforcer that followed the behavior. Result: behavior declines; variability increases; frustration possible. Outcome: not erasure — a competing inhibitory memory forms.

Classical extinction — Procedure: present the conditioned stimulus without the unconditioned stimulus. Result: the conditioned emotional response may decline gradually; on its own it is rarely sufficient for fear, which needs counterconditioning and safety learning alongside it. Outcome: original association intact; strongly context-bound; renewal likely.

Spontaneous recovery — Trigger: elapsed time since the last extinction session. Mechanism: the inhibitory memory becomes less accessible. Response: repeat the procedure; each recovery is typically weaker.

Renewal — Trigger: change of context, including leaving the context where extinction occurred (AAB). Mechanism: extinction is context-bound, the original association is not. Response: vary contexts, and still expect relapse.

Resurgence — Trigger: the replacement behavior stops being reinforced. Mechanism: removing the competitor lets the original re-emerge. Response: keep paying the replacement indefinitely.

Reinstatement — Trigger: a single unpaired encounter with the original reinforcer. Mechanism: the reinforcer restores the expectation. Response: manage the environment; brief visitors and family explicitly.

11. Research Gaps and Critical Appraisal

The neural account is entirely extrapolated. Infralimbic inhibition, NMDA-dependent consolidation, and the pharmacology of extinction enhancement are rodent findings (Quirk & Mueller, 2008; Milad & Quirk, 2012). Nothing comparable exists in dogs.

The behavioral phenomena are better established than the canine specifics. Spontaneous recovery, renewal, resurgence, and reinstatement are robust across species, but most parameter estimates — how long until recovery, how many contexts are enough — come from rodents, pigeons, and human clinical samples.

There is a real canine literature, and it is small. Hall (2017) is the substantive review of persistence and resistance to extinction in dogs, covering behavioral momentum, detection-dog applications, and breed differences (which fits the wider picture on breed and behavior).

Extinction bursts are the exception. They appeared in 24% of analyzed cases, and in 12% when combined with other procedures (Lerman & Iwata, 1995) — human applied behavior analysis, not canine.

Multiple-context training is not a guaranteed fix. The evidence that extinction across several contexts reduces relapse vulnerability is mixed (Bouton, 2004), which qualifies advice that is usually given without hedging.

The inhibitory learning model is a human clinical framework. Craske et al. (2014) address exposure therapy for human anxiety disorders. Its principles map plausibly onto dog training; that mapping has not been tested in dogs.

Individual variation is substantial. Frustration tolerance, persistence, and baseline arousal differ enough between dogs that the same procedure produces markedly different results (as arousal research would predict).

The four routes have not been demonstrated in dogs. Renewal, reinstatement, resurgence and spontaneous recovery are established in rodent and human work (Bouton, 2002, 2004) and have not been tested experimentally in this species.

The extinction burst data are human. The prevalence finding that corrects the popular assumption comes from applied behavior analysis with human participants (Lerman & Iwata, 1995), and no canine equivalent exists.

The canine literature is applied rather than mechanistic. Persistence, partial reinforcement and counterconditioning have been studied in dogs; none of that work addresses whether extinction is inhibitory learning in this species.

Nobody has measured how long recovery persists. How much time must pass before a behavior returns, and how large the return is, has not been quantified in dogs.

12. Conclusion

Extinction is not forgetting and not unlearning. It is the addition of a second memory that competes with the first for retrieval, and that competition is decided largely by context — which is why behavior returns after a pause, in a new place, when a replacement stops paying, or after a single accidental reward. Read that way, relapse stops being evidence of failure and becomes a predictable event with a known response: repeat the procedure calmly, keep the alternative behavior reinforced, prevent accidental reinforcement, and expect each recovery to be weaker than the last. The limits are worth holding alongside the framework. The circuit-level story is borrowed from rodents, the parameter estimates come mostly from other species, and the canine literature is genuinely thin. But the core practical implications do not depend on the neuroscience: build behavior with continuous reinforcement before thinning it, treat extinction alone as generally inappropriate for fear-based behavior, whenever possible, pair it with something that still pays, and treat durable change as something maintained rather than achieved.

Key Insights (Takeaways)

• Extinction does not erase the original learning. It creates a second, context-bound inhibitory memory stored alongside the first, leaving the cue with two available meanings whose expression depends on what the current context retrieves (Bouton, 2002).

• Context-dependence is the defining property, not a detail. Detection dogs whose searching went unreinforced on one route lost performance on that route while remaining accurate on another (Hall, 2017) — and behavior returns simply on leaving the context where extinction happened, which is what AAB renewal describes.

• Extinction bursts are a minority outcome. They occurred in 24% of analyzed cases, and in only 12% when extinction was combined with reinforcing an alternative behavior (Lerman & Iwata, 1995). Differential reinforcement is the practical lever, not a nicety.

• Do not thin reinforcement early to build durability. Intermittent schedules do produce greater resistance to extinction, but in naïve dogs partial rewarding neither sped learning nor left affect untouched (Cimarelli et al., 2021). Build continuously, vary later.

• Extinction is the wrong tool for fear, panic, and self-reinforcing behavior. Fear-based aggression and separation-related distress need desensitization and counterconditioning (Butler et al., 2011; Shnookal et al., 2024); compulsive and self-reinforcing behavior offers no external reinforcer to withhold.

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