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Flank Alopecia in Dogs
What is Flank Alopecia?
Canine flank alopecia is sometimes known as seasonal alopecia because it is a light responsive seasonal disorder. It causes partial or total hair loss on the dog’s flank and back area. Lack of exposure to the sunlight in the months with shorter days seems to be connected to this disorder. It usually begins in late fall into early spring and lasts up to six months. Sometimes this condition recurs yearly, but not in all cases. About 20% of the time is will occur only once in the dog’s life. This disorder is also called cyclic follicular dysplasia, and it is a non-inflammatory condition.
Canine flank alopecia is a syndrome usually occurring in the fall through spring months. It has no known cause and produces hair loss in the flank and back of the dog.
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Flank Alopecia Average Cost
From 291 quotes ranging from $200 - $500
Average Cost
$300

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Symptoms of Flank Alopecia in Dogs
  • Bilateral symmetrical hair loss, particularly in flanks and the back of the dog
  • Dark pigmentation in the areas of the hair loss
  • Hair loss on the base of the tail, nose, and ears of the dog in some cases
  • Skin infection present in the bald spots of the dog
  • Previous bilateral symmetrical hair loss in past fall and winter months
Types
There are two different types of seasonal flank alopecia. Both types are non-inflammatory, which produce no itching or scratching.
  • Hereditary influence may be the cause with some cases of seasonal flank alopecia, although it has not been proven
  • Sunlight amounts may contribute to the onset of seasonal flank alopecia, with indoor or house-bound dogs more likely to become affected by the condition, due to their lack of daily sunshine exposure
Causes of Flank Alopecia in Dogs
There are no known causes of seasonal flank alopecia. Seasonal changes in melatonin and prolactin occur in dogs and other mammals. Lack of exposure to the sunlight to the pineal gland could be responsible. The pineal gland is responsible for producing melatonin, which modulates sleep patterns in seasonal cycles. A lack of sunlight may cause the hair to fall out of some dogs on a seasonal basis. There does not appear to be a sex predilection and it may be hereditary. Some breeds are more susceptible such as Boxers (50% of all cases), Bulldogs, Schnauzers, Labradors, Scottish terriers, Akitas, Airedales, and Doberman pinschers. This condition is more common in areas in that have dark winters. Indoor dogs are most susceptible due to the lack of being outdoors during daylight hours.
Diagnosis of Flank Alopecia in Dogs
Most dogs show signs between November and March each year. If your dog is showing symptoms, he will need to be examined by a veterinarian. Clinical signs and symptoms will be noted, and pigmented bald spots will be identified. Your dog’s breed will be considered, as well as the time of year. Skin biopsies may be necessary, which may detect follicular atrophy (white bumps), comedones (canine acne), epidermal thickness, and hyperpigmentation of the skin. Other diseases and disorders such as Cushing’s disease, thyroid disease, parasites, mites, and bacteria will be ruled out by appropriate testing. The average age of the diagnosis of seasonal flank alopecia is 4 years old.
Treatment of Flank Alopecia in Dogs
Sunlight 
Exposure to sunlight during the months of September through March dramatically lessened the incidence of flank alopecia. Find a way to providing an opportunity for your dog to spend more time outdoors, especially in the fall and winter. This will greatly improve his chances of not developing seasonal flank alopecia.
Melatonin therapy
Melatonin is a hormone that regulates the body of the dog’s daily rhythm. It can help to thicken and regrow the dog’s fur. Melatonin oral supplements or injections may be administered or recommended. Melatonin implants under the skin are available in some countries. Melatonin oral supplements are effective approximately 50% of the time. Follow your veterinarian’s advice on the proper dosage and frequency. Generally, melatonin will be given daily for two or three months until complete hair growth occurs. Restarting melatonin yearly four to six weeks before the anticipated onset of hair loss may prevent recurrence the following year.

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Recovery of Flank Alopecia in Dogs
There is a good, but unpredictable prognosis with most dogs regarding the growing back of their hair. However, some dogs skip a year of hair growth and some may not ever regain all of their hair. Sometimes the hair may even grow back in a different color and texture. Seasonal flank alopecia is a cosmetic disorder and does not affect the health or quality of life of the dog.
Flank Alopecia Average Cost
From 291 quotes ranging from $200 - $500
Average Cost
$300
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Flank Alopecia Questions and Advice from Veterinary Professionals
Lagotto Romagnolo
Enzo
1 Year

6 found this helpful

6 found this helpful

My pet has the following symptoms:
Topcoat Hair Loss
I have a 1 year old Lagotto Romagnolo dog, over the past couple of days he's developed a bald patch on his flank. It's only his topcoat that's come out. He has not been scratching/itching and there's no sign of skin breakage or infection. His flea/tick treatment is by Bravecto, so no spot on treatment. He has no other symptoms and is behaving in his completely normal way. I went to my vet yesterday but they have no idea what the cause is, they suggested I give him cod liver oil and a spray to help hair growth regeneration. I'm wondering if it could be flank alopecia? I'm reluctant to put him through a skin scrape if it's not necessary.
June 20, 2018

Answered by Dr. Michele K. DVM
6 Recommendations
Flank alopecia is typically a symmetrical problem, and having one side affected and not the other makes this diagnosis unlikely. A skin scraping to rule out parasites is a relatively painless, quick procedure, and most dogs can be distracted with food or treats and not even notice that it is happening.
June 20, 2018
If your Lagotto continues to loose hair and the diagnosis is alopecia, please consider participating in the study that is just beginning on Lagotto and alopecia. All it takes is a mouth swab. The Lagotto Club of America FB page has info on what is going on.
July 28, 2018
Lisa S.
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American Bulldog
Ellie
5 Years

4 found this helpful

4 found this helpful

My pet has the following symptoms:
Thinning Hair
About 2 months ago, I noticed a small balding spot on her left hip, about the size of a pencil eraser. I’ve noticed since then, that her hair seems to be thinning on her belly, left side, and legs. She is red and white, and I’m seeing the black pigmented “spots” of her skin a lot more under the thinning white fur. She is not itchy, no fleas, and has no allergies like some bulldogs are plagued with. She just got done nursing a litter of 7 pups (first litter, now 12 wks old) and had great nutrition throughout pregnancy and lactating.
May 24, 2018
4 Recommendations
There are many causes of hair loss/alopecia in dogs which may be caused by a variety of different causes which may include hair loss during pregnancy due to hormonal changes which is not really unusual since pregnancy may put a female on a pregnancy rollercoaster. I would keep an eye on her now after weaning and see if the hair returns in the coming weeks. Regards Dr Callum Turner DVM
May 25, 2018
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goldenlab
Ceaser
3 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Bald Spots
my dog has been slowly getting bald spots. they range from big to small spots. we took him to the vet and they gave us cream and wipes to clean him daily,as we wipe and cream we find new spots. its pinkish , he doesn't seem to be bothered by it. is it contagious, or dangerous to the dog?
April 29, 2018
Answered by Dr. Michele K. DVM
0 Recommendations
Without knowing more about the spots or what is causing them, I can't comment on whether the problem is contagious or a problem for Caesar, unfortunately. Since he was seen by your veterinarian recently, they may hve an idea as to what might be causing the problem, and can give you further guidance on how to resolve it, if it contagious, and what needs to be done for him. I hope that all goes well for him.
April 29, 2018
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Labrador Retriever
Walter
1 Day

10 found this helpful

10 found this helpful

My pet has the following symptoms:
Thinning Hair
Walter is a one year old yellow lab. About a month ago while brushing him I noticed thinning of hair on his hips on both sides and I could see the pink skin showing through. I thought it was from brushing him, but now I’m started to notice two lines on each side (above the pink area) where it appears he’s actually losing fur. He doesn’t itch, scratch, no infections or allergies. I’m wondering if it’s most like seasonal alopecia or if I should take him to the vet. I should note, Walter sheds a lot. Which I know is normal for a lab but we’ve had two other labs in the past (chocolate labs) and they didn’t shed nearly this bad.
Feb. 24, 2018
10 Recommendations
There are many causes for a dog to lose hair or shed excessively which may include seasonal allergies, infections, parasites, hormonal conditions, excessive licking (normally would see evidence of licking) among other causes. I would recommend you visit your Veterinarian to confirm the cause of the localised hair loss and to offer management options if available. Regards Dr Callum Turner DVM
Feb. 25, 2018
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Beagle English Bulldog
Macey
8 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Fur Loss
My dog is losing fur, one spot on her back and two on her rear hind area. The fur started getting crusty and has come out in layers. The spot on her back is exposing some skin but she is not itchy or uncomfortable. The skin is pink, but not red or inflamed. I can brush the spots with not discomfort.
Jan. 16, 2018
Answered by Dr. Michele K. DVM
0 Recommendations
Thank you for your email. Bulldogs are prone to skin problems, and infections. it would be best if Macey saw her regular veterinarian so that they can evaluate her skin, and determine what might be wrong with her. They will be able to prescribe the appropriate medications for her, depending on what they find.
Jan. 16, 2018
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Male Boxer
Schotzie
2 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Seasonal Alopecia
We live in South Texas and have had boxers for many years. At age 2 our latest boxer lost his hair in the flanks. We took him to the vet and she diagnosed it as seasonal alopecia and prescribed melatonin at 5 mg per day. It was cured. At age 3 he developed it again. We started again the melatonin regiment. It has NOT worked and he now has loss of hair across both flanks almost to his front legs and a strip over his back at the end of the flanks. We have had a test of his thyroid gland and the T4 was slightly low. The vet has prescribed Soloxine 0.6 mg 2 times per day. This has not worked. We have lost confidence in the vet and are trying some OTC remedies for hair loss and flees, ticks and mites from Happy Jack (Sarcoptic Mange Medicine). Just started it not results yet. What else can we try?
Shih Tzu
Honey
7 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Hair Loss
I have a 7 year old shihtuz cross lasa. I noticed her coat condition was changing. She was eating as normal. I went away for 4 weeks on return she had lost hair on both flanks,she does have a scratch hereand there. I checked for fleas, but all is ok, but treated anyway. I took her to the vets, they told me is most possible be season alopecia. I said her breath is smelly, like pooh smell, but he seemed unconcerned. I am wndering if i should ask for blood test to chek things out?
Mixed
Buddy
5 Years

1 found this helpful

1 found this helpful

My pet has the following symptoms:
Hair Loss
Sleepiness
My dog is a yellow lab/american staffordshire mix and he's five years old. For the first time he is losing hair on his flanks that I have been told is seasonal alopecia. We've been exposing him to sunlight more and the amount of hair loss has stopped, though I'm hoping his fur will start to grow back soon!
Lurcher
buster
4 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Hair Loss
we have our dog for over fours and when we got him we got told he is a cross bread with two other dogs crossed with a wolf and Alsatian he lost hair all on bottom and back as well as his belly we don't know what to do.
Cane Corso, Boxer, Neapolitan Mastiff
Bosha
6 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Fur Loss
Our 6yr old dog is 25% Boxer, 25% Neapolitan mastiff, and 50% Cane Corso. She loses some fur on flanks and most fur on belly every fall and it grows back every spring. Never seems to bother her in any way.
Flank Alopecia Average Cost
From 291 quotes ranging from $200 - $500
Average Cost
$300

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