Dog Licking Constantly: Paws, People, Objects – What’s Behind It

In brief

Licking is completely normal behavior for dogs: for grooming, in contact with people and other dogs, and as part of body language. It becomes a problem when it increases markedly, can no longer be interrupted or damages the skin. Four things matter. First: excessive licking often has physical causes such as itching, pain or gastrointestinal disease; in a small study, gastrointestinal abnormalities were found in 14 of 19 dogs that conspicuously licked surfaces. Second: even wounds that look like a typical lick granuloma can turn out to be entirely different diseases. Third: behavioral causes such as attention, lack of stimulation, stress or compulsive behavior should only be assumed after a veterinary work-up. Fourth: lip licking is not a clear-cut sign of stress.

This guide shows which licking is normal, what can be behind constant licking, what you should record, when to see the veterinarian quickly and what helps.

1. Licking is normal to begin with

1.1 Grooming

Dogs groom themselves with their tongue. They lick their muzzle after eating, clean their paws after a walk, groom the genital area or lick a small scrape. This is brief, targeted and stops on its own.

In practice: it only becomes interesting when the pattern changes: the licking lasts longer, happens more often, always targets the same spot or leaves marks.

1.2 Licking people and other dogs

Many dogs lick their people’s hands, face or legs, especially when greeting. Licking also occurs between dogs, for example at the other dog’s muzzle. In a pilot study on communication between dogs, licking the other dog’s muzzle was more frequent when the dogs knew each other, while many other calming signals were more frequent toward unfamiliar dogs (Mariti et al., 2017). This is an observational pilot study with 24 dogs.

In practice: if your dog licks you mainly when greeting and can easily be redirected, it is usually social behavior.

1.3 Lip licking as a signal: only in context

A quick lick over the nose or lips is often described as an appeasement or stress signal. The evidence is more nuanced. Firnkes et al. (2017) observed 116 dogs in a standardized test in which unfamiliar people behaved neutrally, in a friendly way or threateningly. Lip licking and looking away occurred more often in threatening and conflict-laden situations, and the authors see them as possible appeasement signals toward humans. At the same time, lip licking was a common part of perfectly ordinary, friendly greeting, and under major threat the dogs actually showed these behaviors less often than in milder situations.

In an experiment in which dogs viewed pictures of faces, they licked their mouths more often when they saw negative rather than positive facial expressions, and more often with human faces than with dog faces. The accompanying sounds made no difference (Albuquerque et al., 2018). The authors interpret this as a possible response to emotional expressions. Whether licking is a signal to others, an expression of the dog’s own state or both, the study does not settle.

For everyday life this means: a single lip lick says little. Only together with the situation and other signs such as a tense posture or freezing does a picture emerge, and sometimes it is simply about food.

👉 Canine body language

2. When licking is too much

There is no fixed threshold for how many minutes of licking a day count as abnormal. Reviews of repetitive behavior in dogs describe a continuum instead, from ordinary repetition to behavior that clearly impairs the dog’s everyday life (Tynes & Sinn, 2014; Bowen & Fatjó, 2024).

In practice: the following signs suggest that the licking deserves a closer look:

• The licking has increased markedly or has appeared suddenly.
• It is hard to interrupt or starts again right away.
• It interrupts other activities such as eating, playing or sleeping, or the dog wakes up at night because of it.
• It leaves marks: wet or reddish-brown stained fur, red, bald or open spots.
• The dog licks floors, walls, rugs or furniture extensively, without any food residue there.
• Other changes come with it, such as lip smacking, frequent swallowing, eating grass, restlessness, changed eating behavior or lameness.

3. Medicine first: physical causes

The most important rule with constant licking is: rule out the body first, then interpret the behavior. A practitioner review of repetitive behaviors in dogs and cats stresses that medical conditions and pain are frequently mistaken for such behaviors and that a full medical evaluation belongs before the behavioral diagnosis (Tynes & Sinn, 2014). This is a narrative review without its own data, but the following examples show why this order makes sense.

3.1 Itching and allergies

Paw licking is a typical sign of itching. The guidelines for diagnosing atopic dermatitis, a common allergic skin disease, list excessive grooming and licking among itch behaviors, and the paws and lower legs are among the most commonly affected sites (Hensel et al., 2015). The diagnosis there is a clinical one: it rests on typical findings and on ruling out other causes with similar signs, such as fleas, mites or skin infections. With year-round itching or concurrent gastrointestinal signs, a food elimination trial is part of it. According to the guidelines, allergy tests are not used to make the diagnosis, but only afterward, to select allergens for immunotherapy.

👉 Itching in dogs

3.2 Pain

How important pain is for behavior problems overall is shown by a review in which experienced clinicians went through 100 recent canine behavior cases. By a conservative estimate, a painful component played a role in roughly a third (Mills et al., 2020). These were mixed behavior cases, not specifically dogs that lick a lot. So the figure doesn’t say how often pain is behind licking, but it does say that pain should be kept in mind.

In practice: dogs often lick spots that hurt, such as a joint, an injury between the toes or an inflamed nail. If an older dog keeps licking a wrist, knee or hock, osteoarthritis is an obvious question to ask your veterinary practice. Watch whether he favors the leg or gets up stiffly.

👉 Hidden pain in dogs

3.3 Stomach and gut: when your dog licks floors and objects

Bécuwe-Bonnet et al. (2012) thoroughly examined 19 dogs presented for excessive licking of surfaces and 10 healthy control dogs, including a complete gastrointestinal work-up. Gastrointestinal abnormalities were found in 14 of the 19 licking dogs, including inflammatory changes of the intestinal lining, delayed gastric emptying, chronic pancreatitis, a gastric foreign body and giardiasis. After treatment based on the findings, the licking improved markedly in more than half of the dogs followed up.

This is a small study from a university hospital, and the treatment phase had no comparison group. It does not show that licking surfaces always has a gastrointestinal cause. It does show that treating such behavior as a purely behavioral problem without an examination would be premature.

👉 Visceral pain and behavior in dogs

3.4 Nausea

In practice: frequent lip licking, lip smacking, increased swallowing, drooling, eating grass or restlessness, often in the hours before vomiting or at night, are typical signs of nausea.

3.5 The lick granuloma

Some dogs lick one spot, often on the front of a foreleg or on a hind leg, until an open, thickened wound develops. This acral lick dermatitis, also called a lick granuloma, is often regarded as a behavioral problem. A case series shows why appearance alone is not a diagnosis: in six dogs with wounds that looked like typical acral lick dermatitis, the underlying causes turned out to be a lymphoma, a metal pin from earlier bone surgery, a deep bacterial skin infection, a mast cell tumor, leishmaniosis and a suspected fungal infection (Denerolle et al., 2007).

Six dogs say nothing about how common such causes are. The message is clear all the same: a lick wound needs to be examined by a veterinarian.

4. Behavioral causes

Only when physical causes have been ruled out or treated and the licking persists do behavioral causes move to the foreground.

4.1 Attention

Licking can be maintained by the human’s response. Hall et al. (2015) systematically tested what maintained the behavior in five dogs with stereotypic or compulsive behavior. In two dogs it was the owners’ responses, and in one of them the behavior was licking. In two others the movement of light alone maintained the behavior, with no social consequence at all. Where the maintaining consequence was changed, the behavior decreased in all three dogs treated that way. These are very few dogs, but the same behavior can have quite different reasons in different dogs.

In practice: if your dog licks mainly when you are on the phone, watching TV or talking to someone else, and you react every time, even just with “Stop that!”, that very reaction can make the licking worthwhile.

4.2 Boredom and lack of stimulation

A dog with little to do looks for something to do, and licking is always available. In a questionnaire study of almost 4,500 Finnish dogs, repetitive behavior was more common in dogs that got little exercise and in dogs living without other dogs (Sulkama et al., 2022). This concerned repetitive behavior overall, not licking specifically. The data come from owner reports and show associations, not causes.

In practice: licking out of boredom typically occurs in quiet phases, when the dog is lying alone and nothing is going on, and can easily be interrupted by an offer to sniff or chew.

4.3 Stress and conflict

The lip-licking studies show that brief licking can occur more often in tense situations (Firnkes et al., 2017; Albuquerque et al., 2018). They say nothing about prolonged licking of the dog’s own body.

In practice: we also often see extensive licking of the dog’s own body in situations that are stressful for the dog. Typical triggers are being left alone, visitors, loud noises, conflicts with other dogs in the household or changes in the daily routine. If the licking always starts in the same situations, that is an important clue.

4.4 Compulsive behavior

In a small proportion of dogs, licking becomes a behavior that can hardly be interrupted, takes up a lot of time and damages the skin. Professionals then speak of compulsive behavior or abnormal repetitive behavior. A clinical review points out that such behavior is often overlooked or dismissed as a harmless quirk, and proposes assessing medical, environmental and temperamental factors separately (Bowen & Fatjó, 2024). The realistic goal is often to reduce the behavior markedly rather than to make it disappear completely (Tynes & Sinn, 2014).

👉 Compulsive behavior in dogs

5. How to tell the causes apart

In practice: you can’t make a diagnosis at home, but you can provide what the veterinary practice lacks most: precise observations from everyday life.

5.1 Keep a licking diary

In practice: for one to two weeks, note every longer bout of licking in a few keywords:

• When: time of day, before or after eating, at night, after a walk.
• Where: which body part or which object, in which room.
• How long: roughly, and whether it could be interrupted.
• What came before: being alone, visitors, noises, play, rest.
• What else you notice: scratching, lip smacking, swallowing, eating grass, vomiting, diarrhea, lameness, restlessness.

5.2 Take videos

In practice: a short video of a typical licking bout is often worth more at the clinic than any description. Film from a little distance, without intervening. Photograph affected skin areas before any treatment.

5.3 Patterns that give clues

In practice: these patterns are not proof, but they are good questions. Mainly paws, plus scratching and nibbling, rather seasonal: itching. Always the same spot on a joint, plus stiffness or favoring the leg: pain. Floors and objects, plus lip smacking, swallowing, eating grass or restlessness at night: stomach and gut. Mainly when you are there and react: attention. In quiet, uneventful phases: lack of stimulation. In particular stressful situations: stress.

6. When to see the veterinarian quickly

In practice: any markedly increased or new licking should be checked. You should act promptly in these cases:

• Open, oozing, bleeding or rapidly growing spots or a wound that doesn’t heal.
• Lameness, swelling or a clear pain reaction when touched.
• Licking floors or objects together with vomiting, diarrhea, loss of appetite or marked restlessness.
• Frequent licking of the genital area or anus, especially together with frequent urination, straining or scooting.
• The dog can no longer be interrupted or is injuring himself.

In practice: call your veterinary practice or the emergency service immediately, even at night, if your dog is drooling heavily, smacking his lips and retching without vomiting, and has a bloated belly or is very restless. This can point to gastric torsion (bloat), which is an emergency.

7. What helps

7.1 Treat the physical cause

If a physical cause is found, treating it is the most important step. In the study on licking of surfaces, the licking improved in more than half of the dogs followed up after the gastrointestinal disease that had been found was treated (Bécuwe-Bonnet et al., 2012). With itching, the work-up often takes time because several causes are ruled out one after another (Hensel et al., 2015).

In practice: keep the licking diary going during treatment, so you can see whether anything changes.

7.2 Provide activity and enrichment

In practice: give your dog regular opportunities for activities that leave him content and calm: extensive sniffing on walks, food search games, chewing on suitable chews or licking a spread lick mat. There are no controlled studies that have tested such offerings specifically against excessive licking. In the questionnaire data, little exercise was associated with more repetitive behavior (Sulkama et al., 2022), but the association has not been shown to be causal.

7.3 Redirect rather than just interrupt

In practice: when your dog starts licking, calmly offer him an alternative he can do instead, for example a chew, a small search game or a cue he knows well and is rewarded for. If the licking is maintained by your attention, it helps to give attention mainly when he is not licking (Hall et al., 2015).

7.4 Don’t punish

Scolding, staring or pushing your dog away can stop the licking in the moment. The question is what your dog learns from it and at what cost. If the licking has a physical cause, the cause remains, and the dog may simply lick in secret. If stress is involved, another stressor is added. And even a negative reaction can be exactly the attention that maintains the behavior (Hall et al., 2015).

👉 Punishment fallout in dogs

7.5 Cones, bandages and bodysuits only as agreed with your veterinarian

In practice: a cone, a bandage, a protective boot or a bodysuit can protect a wound from further licking and give it time to heal. But they don’t treat the cause, and if applied incorrectly they cause problems of their own, such as pressure sores or moisture under the bandage. So use them only as agreed with your veterinary practice. The same applies to sprays, ointments or bitter-tasting products: only what your veterinarian has recommended belongs on an open wound.

8. A note on the evidence

There are only a few targeted studies on licking in dogs, and most are small. The study on gastrointestinal disease (Bécuwe-Bonnet et al., 2012) included 19 presented dogs and 10 control dogs from a university hospital, and its treatment phase had no control group. The case series on lick granuloma (Denerolle et al., 2007) describes six dogs from a dermatology service and says nothing about frequencies. The study by Hall et al. (2015) included five dogs. The estimate on pain (Mills et al., 2020) comes from mixed behavior cases, not from dogs that lick a lot.

The studies on lip licking (Firnkes et al., 2017; Albuquerque et al., 2018; Mariti et al., 2017) are observational or were conducted in the lab with pictures. The Finnish questionnaire data (Sulkama et al., 2022) rest on owner reports, concern repetitive behavior in general and show associations, not causes. The atopic dermatitis guidelines (Hensel et al., 2015) and the reviews on repetitive behavior (Tynes & Sinn, 2014; Bowen & Fatjó, 2024) summarize expert knowledge and clinical experience. The advice on nausea, recording, warning signs, activity, redirection and protective measures is practical experience and is marked as such.

9. Conclusion

Licking is part of normal dog behavior. But if it increases markedly, always targets the same spot, is directed at floors and objects or damages the skin, there is often something physical behind it. Behavioral causes exist, but they should only be assumed after a work-up.

The three things that make the difference:

Rule out the body first. Itching, pain and gastrointestinal disease come before any behavioral interpretation.

Observe closely and keep records. When, where, how long and what came before, plus videos and photos.

Redirect instead of punishing. Activity, alternatives and rewards for calm moments, protective measures only as agreed with your veterinarian.

Key takeaways on a dog licking constantly

Lip licking has no fixed meaning. In 116 dogs it occurred more often in threatening situations, but was also part of friendly greeting (Firnkes et al., 2017).

Negative facial expressions went with more mouth licking. Dogs licked their mouths more often when viewing negative faces than positive ones (Albuquerque et al., 2018).

Licking surfaces can have a gastrointestinal cause. Gastrointestinal abnormalities were found in 14 of 19 dogs that conspicuously licked surfaces (Bécuwe-Bonnet et al., 2012).

The look of a lick wound is not a diagnosis. Six apparently typical lick granulomas turned out to be six different physical diseases (Denerolle et al., 2007).

Pain is often involved in behavior problems. In 100 reviewed behavior cases, a painful component played a role in roughly a third by a conservative estimate (Mills et al., 2020).

What maintains licking differs from dog to dog. In some dogs it was the owner’s response, in others it was not (Hall et al., 2015).

Working on a behavior problem with your dog? Our step-by-step dog behavior workbooks cover leash reactivity, being left alone, resource guarding, two-dog households, barking at passersby and noise fear.

References

• Albuquerque, N., Guo, K., Wilkinson, A., Resende, B., & Mills, D. S. (2018). Mouth-licking by dogs as a response to emotional stimuli. Behavioural Processes, 146, 42–45. https://doi.org/10.1016/j.beproc.2017.11.006
• Bécuwe-Bonnet, V., Bélanger, M.-C., Frank, D., Parent, J., & Hélie, P. (2012). Gastrointestinal disorders in dogs with excessive licking of surfaces. Journal of Veterinary Behavior, 7(4), 194–204. https://doi.org/10.1016/j.jveb.2011.07.003
• Bowen, J., & Fatjó, J. (2024). Repetitive behaviors in dogs. Veterinary Clinics of North America: Small Animal Practice, 54(1), 71–85. https://doi.org/10.1016/j.cvsm.2023.09.003
• Denerolle, P., White, S. D., Taylor, T. S., & Vandenabeele, S. I. J. (2007). Organic diseases mimicking acral lick dermatitis in six dogs. Journal of the American Animal Hospital Association, 43(4), 215–220. https://doi.org/10.5326/0430215
• Firnkes, A., Bartels, A., Bidoli, E., & Erhard, M. (2017). Appeasement signals used by dogs during dog–human communication. Journal of Veterinary Behavior, 19, 35–44. https://doi.org/10.1016/j.jveb.2016.12.012
• Hall, N. J., Protopopova, A., & Wynne, C. D. L. (2015). The role of environmental and owner-provided consequences in canine stereotypy and compulsive behavior. Journal of Veterinary Behavior, 10(1), 24–35. https://doi.org/10.1016/j.jveb.2014.10.005
• Hensel, P., Santoro, D., Favrot, C., Hill, P., & Griffin, C. (2015). Canine atopic dermatitis: Detailed guidelines for diagnosis and allergen identification. BMC Veterinary Research, 11, Article 196. https://doi.org/10.1186/s12917-015-0515-5
• Mariti, C., Falaschi, C., Zilocchi, M., Fatjó, J., Sighieri, C., Ogi, A., & Gazzano, A. (2017). Analysis of the intraspecific visual communication in the domestic dog (Canis familiaris): A pilot study on the case of calming signals. Journal of Veterinary Behavior, 18, 49–55. https://doi.org/10.1016/j.jveb.2016.12.009
• Mills, D. S., Demontigny-Bédard, I., Gruen, M., Klinck, M. P., McPeake, K. J., Barcelos, A. M., Hewison, L., Van Haevermaet, H., Denenberg, S., Hauser, H., Koch, C., Ballantyne, K., Wilson, C., Mathkari, C. V., Pounder, J., Garcia, E., Darder, P., Fatjó, J., & Levine, E. (2020). Pain and problem behavior in cats and dogs. Animals, 10(2), Article 318. https://doi.org/10.3390/ani10020318
• Sulkama, S., Salonen, M., Mikkola, S., Hakanen, E., Puurunen, J., Araujo, C., & Lohi, H. (2022). Aggressiveness, ADHD-like behaviour, and environment influence repetitive behaviour in dogs. Scientific Reports, 12, Article 3520. https://doi.org/10.1038/s41598-022-07443-6
• Tynes, V. V., & Sinn, L. (2014). Abnormal repetitive behaviors in dogs and cats: A guide for practitioners. Veterinary Clinics of North America: Small Animal Practice, 44(3), 543–564. https://doi.org/10.1016/j.cvsm.2014.01.011

Note: This guide does not replace a veterinary examination or individual advice. If your dog licks markedly more than before, has open spots, is limping or also shows gastrointestinal signs, have him examined by a veterinarian.

Frequently asked questions about a dog licking constantly

Causes, the veterinarian and everyday life