Canine Lick Granulomas: If You Don’t Know What A Lick Granuloma Is, Count Your Blessings!

If you’ve no idea what a lick granuloma is, count your blessings! What a nuisance they can be!

The official name for this disease is acral lick dermatitis.  “Acral” refers to an extremity (leg) and “dermatitis” means inflammation of the skin. The “lick” is thrown in because an incessant licking behavior is what causes the problem.

Acral lick granulomas are skin sores that typically occur in large breed dogs. It particularly affects Doberman Pinchers and Labradors, and more males than females.

Canine Lick Granulomas: If You Don't Know What A Lick Granuloma Is, Count Your Blessings!

Introduction

For reasons we truly don’t understand, affected dogs pick a spot towards the foot on one or more of their legs and begin licking…… and licking, and licking and licking.  The effect on the skin is no different than if you picked a spot on your arm and scratched at it round the clock.

The chronic self-inflicted irritation can result in

  • thickening of the skin
  • increased pigmentation (skin appears darker than normal)
  • an ulcerated surface with bleeding
  • and infection complete with pus, redness, and tenderness

The average lick granuloma varies from dime-sized up to the size of a silver dollar.

If You Don't Know What A Lick Granuloma Is, Count Your Blessings!

What causes lick granulomas?

Acral lick granulomas may be initiated by something that traumatizes or irritates the skin such as infection, allergy, or an embedded foreign body such as a thorn or splinter.

The dog overreacts lingually (no tongue in cheek here) and, over time, a lick granuloma appears.  It’s theorized that incessant licking may represent a self-soothing behavior (like thumb-sucking) associated with the release of endorphins.  This theory is supported by the fact that, if one is savvy enough to interrupt the licking cycle at one site, many clever dogs redirect their attention to a new site on a different leg.

Another possibility is that arthritis is present in the joint underlying the affected skin surface.  

Licking is tantamount to a person massaging a sore joint.  Yet another theory is that boredom is the culprit. Truth be told, there are likely many different causes for lick granulomas.

How is it diagnosed?

The diagnosis of acral lick dermatitis is officially made via skin biopsy.

Your veterinarian may also recommend a skin scraping (material is scraped from the skin surface for evaluation under the microscope to rule out mange mites) and collection of samples for bacterial and fungal cultures.  Some veterinarians feel comfortable making the call based purely on history and visual inspection of the affected skin site.

Making the diagnosis is the easy part.  Stopping the licking is notoriously difficult.

In fact, it can be a nightmare because many affected dogs simply will not be deterred from this obsessive behavior.  And even when one thinks the problem is licked (pun intended), a year or two down the road, the self-trauma cycle may begin all over again.

How is it treated?

The ideal therapy for lick granulomas is the identification and treatment of the underlying cause (foreign body, allergy, infection).

If the cause cannot be determined (true for most dogs with lick granulomas) and eliminated, here are some therapeutic options.  Keep in mind, what works well for one dog may not work for another.

Keep the site covered with a bandage

You can use standard bandaging material or one of your own socks might be suitable.  Simply cut off the foot part and pull the tube section up over the affected area.  Secure in place with some tape.  If the lick granuloma is low enough on the leg, you can slip the dog’s foot into the toe of the sock. 

A product called DogLeggs may be worth a try as well.  If you are really, really, really lucky, your dog who is obsessed with applying his mouthparts to the spot you’ve covered will leave the bandage in place. 

Warning!  It is extremely easy to put a bandage on that is too tight (a recipe for disaster).  Practice bandaging with a member of your veterinary team watching before trying it yourself at home. 

Second warning!  Your dog may go one step beyond removing the bandage- he or she may eat the darned thing.  Close supervision is a must for the first day or two after accessorizing your dog with a bandage.  The last thing anyone wants is for a lick granuloma issue to morph into a gastrointestinal foreign body issue.

Taste deterrents

Taste deterrents work for some dogs and there are a variety of products on the market (Bitter Apple is the classic).  If this is to stand a chance of breaking the cycle, the application must be frequent and consistent. 

Most dogs are so determined to lick that they will persevere in spite of the adverse taste reaction, and in all honesty, the looks on their faces after licking the nasty stuff time after time suggests that this “solution” may be less than humane.

Elizabethan collars

Elizabethan collars work well for some dogs.  Don’t forget to rearrange your house in advance so that nothing valuable is damaged as your dog learns to navigate his surroundings with a satellite dish around his neck.  (No, your television reception will not be enhanced.)

Medications

Medications can be applied to the site that are anti-inflammatory in nature and/or help rebuild healthy tissue.  These typically must be accompanied by a method for keeping tongue away from the skin so the medication has a fighting chance.

Acupuncture/chiropractic

Acupuncture and/or chiropractic treatments are thought to work for some dogs.

Laser therapy

Laser therapy at the site is successful with some lick granulomas.

Distraction

See if keeping your dog super-busy for a week or two breaks the cycle.  The hope is to alleviate boredom and/or create a dog that is too tired to lick.  Try increased play/exercise, a large Kong toy filled with peanut butter, doggie daycare while you are away from home, or adoption of a playmate (careful here- sometimes the stress of a new animal in the household amplifies licking behavior).

Behavior modification medication

Behavior modification medications work for some incessant lickers but should be tried when other efforts have failed.  Categories of medications that can be tried include tricyclic antidepressants, serotonin-inhibiting drugs, and endorphin blockers.

Tricky to deal with

It’s a given that the more treatment options there are for a particular disease, the less we know about how best to treat it!

Lick granulomas are a classic example.  If your dog is afflicted, I strongly encourage you to enlist help from your veterinarian.  If, together you try two or three things without success, please consider consulting with a board-certified dermatologist.  To find one in your neighborhood visit the American College of Veterinary Dermatology website.

Although a lick granuloma looks like a small problem, it can be downright difficult to cure.

If your dog’s lick granuloma remains small and clear of infection, and if the sound of licking is not keeping you awake at night, simply living with the problem is a reasonable choice to consider.

Has your dog had a lick granuloma?  What worked for you?

Related articles:
Excessive Licking in Dogs: Why Is My Dog Licking Incessantly?

Further reading:
Just Ask the Expert: How do you combat acral lick dermatitis?

Categories: Lick granulomaSkin issues

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Dr. Nancy Kay

Dr. Nancy Kay wanted to become a veterinarian for just about as long as she can remember. Her veterinary degree is from Cornell College of Veterinary Medicine, and she completed her residency training in small animal internal medicine at the University of California-Davis Veterinary School. Dr. Kay is a board-certified specialist in the American College of Veterinary Internal Medicine and published in several professional journals and textbooks. She lectures professionally to regional and national audiences, and one of her favorite lecture topics is communication between veterinarians and their clients. Since the release of her book, Speaking for Spot: Be the Advocate Your Dog Needs to Live a Happy, Healthy, Longer Life, Dr. Kay has lectured extensively and written numerous magazine articles on the topic of medical advocacy and veterinarian/client communication. She was a featured guest on the popular National Public Radio show, Fresh Air with Terry Gross. Dr. Kay's newest book is called, Your Dog's Best Health: A Dozen Reasonable Things to Expect From Your Vet. Her award-winning blog, "Spot Speaks" is posted weekly (www.speakingforspot.com/blog). Dr. Kay was selected by the American Animal Hospital Association to receive the 2009 Hill�s Animal Welfare and Humane Ethics Award. This award is given annually to a veterinarian or nonveterinarian who has advanced animal welfare through extraordinary service or by furthering humane principles, education, and understanding. Dr. Kay was selected as the 2011 Leo K. Bustad Companion Animal Veterinarian of the Year, an award presented every year by the American Veterinary Medical Association to a veterinarian whose work exemplifies and promotes the human-animal bond. Dr. Kay has received several awards from the Dog Writer�s Association of America. Dr. Kay's personal life revolves around her husband (also a veterinarian), her three children (none of whom aspire to be veterinarians) and their menagerie of four-legged family members. When she's not writing, she spends her spare moments in the garden or riding atop her favorite horse. Dr. Kay and her husband reside in Hendersonville, North Carolina.

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