Pinnal Alopecia in Dogs

Written By hannah hollinger
Published: 04/20/2017Updated: 11/19/2021
Veterinary reviewed by Dr. Linda Simon, MVB MRCVS
Pinnal Alopecia in Dogs - Symptoms, Causes, Diagnosis, Treatment, Recovery, Management, Cost

What is Pinnal Alopecia?

With pinnal alopecia, the hair loss may be gradual or sudden, and usually follows a pattern. For example, one ear may lose hair in the exact same pattern as the other. In most cases, pinnal alopecia begins around six months to one year of age and gradually gets worse until the ears are completely bald at about eight to nine years of age. This condition does not normally cause any other side effects besides baldness and does not affect their quality of life in any way. It is more of a cosmetic condition that bothers the owner more than their dog. However, underlying conditions do need to be ruled out so it is important that you take your dog to the veterinarian as soon as you can to get him checked out.

Pinnal alopecia is baldness of the ears that is not accompanied by itching or rash. This condition usually starts in the first year of life on the outer edges of the ears and may turn the skin dark in patches as well. In some cases, pinnal alopecia can eventually (over many years) spread to the rest of the body, but this is not common. There are a few other ear conditions that can mimic pinnal alopecia such as seborrheic dermatitis, localized demodicosis, and certain endocrine disorders. The cause of pinnal alopecia is unknown, but it mostly affects Dachshunds, American or Portuguese Water Spaniels, Chihuahuas, Italian Greyhounds, Whippets, Manchester or Boston Terriers, and Miniature Poodles.

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Symptoms of Pinnal Alopecia in Dogs

The signs of pinnal alopecia may be sudden and severe or gradual and mild. In some cases, you may not even notice the hair loss until the hair is completely gone from the ears. With pinnal alopecia, there should be no inflammation or redness and your dog usually does not seem to notice the hair loss. Some of the things you may notice are:

  • Gradual or sudden thinning of hair on the ears
  • Hairs become thinned out to the point of baldness
  • Darkened skin of the ears where there is hair loss
  • Symmetrical baldness on both ears
  • Total complete baldness of the entire ear does not usually happen until your dog is older middle aged


  • Gradual pinnal alopecia is the most common and happens over a lengthy period of time with fur becoming sparse and thinning out
  • Sudden pinnal alopecia happens quickly, with large amounts of hair falling out within a few days

Causes of Pinnal Alopecia in Dogs

The cause is unknown, but it seems to be hereditary. It is most commonly seen in:

  • Dachshunds
  • American or Portuguese Water Spaniels
  • Chihuahuas
  • Italian Greyhounds
  • Whippets
  • Manchester or Boston Terriers
  • Miniature Poodles

Diagnosis of Pinnal Alopecia in Dogs

To diagnose pinnal alopecia in your pet, the veterinarian will need a complete medical history and immunization records if you have them. It is also imperative that you let the veterinarian know if your dog is on any medications. A thorough physical examination is the first thing the veterinarian will do, paying special attention to the skin and hair (or lack of hair) on the ears. A skin scraping will be taken for histopathology and samples of pinnal secretions are microscopically evaluated as well.

The results should reveal short hair follicles with thin hair shafts and no other abnormalities. To make sure your dog is not suffering from some other ailment, laboratory tests need to be performed such as blood testing, urinalysis, fecal exam, and imaging. Some of the conditions that need to be ruled out include alopecia areata, demodicosis from mites, dermatophytosis (ringworm), hormone responsive dermatosis hypothyroidism, hyperadrenocorticism, and hair follicle dysplasia.

Treatment of Pinnal Alopecia in Dogs

Although this condition does not seem to cause any pain, itching, or other discomfort, many pet owners prefer to try to treat pinnal alopecia. There are some herbal remedies that may be helpful but have not been proven. Some veterinarians may suggest testosterone treatment for males, to induce hair growth.


Giving five milligrams of melatonin by mouth daily for four to six weeks is the most common treatment recorded. However, the results have been mixed.


In some cases, the veterinarian may approve a small dose of methyltestosterone to stimulate hair growth. However, since the side effects of these types of anabolic steroids are serious, most veterinarians do not agree to this. Because pinnal alopecia does not cause any harm or discomfort to your dog, your veterinarian will probably suggest melatonin instead, if anything.

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Recovery of Pinnal Alopecia in Dogs

As stated above, pinnal alopecia usually affects the dog owner more than the dog. There is no need for treatment as it does not cause any pain or itching at all. However, if you decide to try one of these treatments, be sure to let your veterinarian know and follow up within 30 days for re-evaluation.

Pinnal Alopecia Questions and Advice from Veterinary Professionals


French Bulldog



Five Months


10 found this helpful


10 found this helpful

My pet has the following symptoms:
No Hair Behind Ears
Is it normal for a frenchie to have symmetric bald spots behind both ears? The skin is also dark. Its been like this since we got her.

Aug. 4, 2020

Answered by Dr. Michele K. DVM

10 Recommendations

Thank you for your question. It isn't abnormal for that breed of dog to have thin hair behind their ears or in front of their ears. It may be quite normal for your dog. Since I cannot actually examine her, it would probably be a good idea to check with your veterinarian at your next appointment, and see if there is anything abnormal with what you are noticing. If she is not itching or there is not excessive hair loss, it does not seem like it should be an emergency, but it would probably be worth mentioning at some point. I hope that all goes well with your puppy.

Aug. 4, 2020

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1 Year


14 found this helpful


14 found this helpful

My pet has the following symptoms:
Hair Loss
My miniature dachshund has been diagnosed with pinnal Alopecia as he had sudden hair loss. He is 11 lbs and my vet didn’t know a lot about the condition. I am debating melatonin but want to know how much to give. My vet didn’t know anything about this course of treatment. Does the hair often grow back in these cases?

March 3, 2018

14 Recommendations

Dachshunds are over represented in cases of pinnal alopecia and typically affects dogs between the ages of one and three, before a diagnosis can be made other causes of alopecia need to be ruled out first which may include parasites, infections, allergies, autoimmune disease among other causes. There is no approved treatment for pinnal alopecia but melatonin at a dose of 3mg (that is 3mg taken orally as one dose not 3mg/lb) every eight hours for up to two or three months may result in the resolution of the alopecia and may be repeated if the condition recurs, I have no statistics on the efficacy of treatment. Regards Dr Callum Turner DVM

March 3, 2018

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