What are Pattern Baldness?
Dogs, like people, can be afflicted with a disorder known as pattern baldness, a symmetrical loss of hair with no known underlying disease. In some cases, hyperpigmentation of the skin materializes where the hair is lost, and the skin grows darker. The overall triggers for pattern baldness are believed to be genetic in nature, and certain breeds are more likely to develop this disorder than others. A few of the several breeds that are over-represented include Dachshund, Boxers, and Chihuahuas. Although unsightly, this disorder is primarily cosmetic in nature, and it doesn’t cause itching, swelling, or pain.
Pattern baldness, or the symmetrical loss of hair, is a genetic abnormality that causes unsightly bare patches, but rarely causes any discomfort to the animal.
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Symptoms of Pattern Baldness in Dogs
Most forms of symmetrical baldness occur after the dog is six months old or older, although some types of non-symmetrical alopecia may occur when they are just puppies. The most common places to find baldness on dogs are around the temples, the front of the throat area, the flank, and the back of the thighs. The skin may or may not become hyperpigmented, and unless a secondary condition has developed, no pain or swelling is involved with this disorder.
- Hair loss (temples, throat, flank, back of thigh)
- Hyperpigmentation of the skin (sometimes)
- Alopecia X - Canine alopecia X, also known as Black Skin Disease, affects adolescent or adult who then dogs lose their hair in symmetrical patterns; the skin underneath the lost fur blackens due to hyperpigmentation
- Seasonal (Recurrent) Flank Alopecia - Dogs with this disorder lose hair symmetrically in the flank area on a seasonal basis; the season that the flank is affected can differ from dog to dog, however, fall and spring are typical
- Symmetrical Pattern Alopecia - A relatively common skin condition where the hair begins thinning as early as six months old, usually on the head, neck, chest and thighs; hyperpigmentation sometimes occurs, but not always
Causes of Pattern Baldness in Dogs
Pattern baldness is typically caused by a congenital form of follicular dysplasia, which is the gradual thinning of the hair due to a structural abnormality or narrowing of the hair follicles themselves. Although most forms of follicular dysplasia can cause alopecia, or balding, not all of them cause pattern balding. Some conditions, such as obesity, hormonal imbalances, and stress, may contribute to the development of alopecia.
Diagnosis of Pattern Baldness in Dogs
Pattern baldness is a diagnosis of exclusion, so several testing methods are likely to be utilized. Skin samples are typically collected from any areas that are affected by the baldness, both for utilization in the microscopic examination of the skin cells known as a cutaneous cytology and for use in a biopsy, and hair samples including the roots may be evaluated by the laboratory as well. The results from the cutaneous cytology and the biopsy can help the examining veterinarian to eliminate other issues that can cause the loss of hair, such as bacterial or fungal infections or infestations by parasites such as mites or fleas.
Typical blood tests like a biochemistry profile and complete blood count will also be employed to check for disorders such as a systemic infection or even hormonal imbalances which can cause similar symptoms. Some of the hormonal disorders that incorporate canine baldness as a symptom include hyperthyroidism and Cushing’s disease (hyperadrenocorticism).
Treatment of Pattern Baldness in Dogs
Pattern baldness is not usually curable, although melatonin is a hormone supplement that may stimulate the regrowth of the fur. Although other forms such as a capsule, sublingual, and powder form are seen, this hormone is typically administered to canines by way of a tablet. A veterinary professional should always be consulted before adding supplements to your dog’s routine to ensure there will be no adverse effects due to pre-existing conditions or other medications. If treatment with melatonin is successful, signs of regrowth will occur after approximately six to eight weeks.
In certain cases, particularly with Alopecia X, spaying or neutering the animal may result in the re-growth of the coat. Unfortunately, these situations are often temporary, and the hair loss returns. Skin affected by pattern baldness is slightly more prone to developing bacterial infections, and if the results from the diagnostic tests are indicating that a bacterial infection may be present, then either oral or topical antibiotics will be prescribed to eliminate the disease.
Recovery of Pattern Baldness in Dogs
If your pet has had antibiotics prescribed to them, it is important to ensure that your pet continue with the medication for as long as is recommended by your veterinarian, sometimes even after symptoms have faded. This will help to prevent the recurrence of the bacterial infection. Dogs that have patches of skin that are bare will require regular bathing to remove dead skin cells, and the uncovered areas should also be moisturized regularly to maintain elasticity. The parts of the dog that are exposed to the sun will be more prone to sunburn and melanomas than furred areas, and any bare spots should be treated with sunblock to prevent complications.
Pattern Baldness Questions and Advice from Veterinary Professionals
my british bulldog is female and about to turn two years old in june and has recently developed a symetrical balding pattern going down her back with slight swelling towards the balding on her rear back. she`s always had flare ups of pink skin and becomes warm but is generally in great health.
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My dog is 8months old. She is a pariah dog.
She was adopted .we found her on the streets.
She has lost hair and we have been taking her to vet for the last 2 months but nothing is working. Also the loss is only on one side. The other side has almost full amount of hair except on a little spot. Anyways, we have beeb giving her the medicines prescribed but nothing is working. Ican see tiny hairs on one of the no hair area but the hair loss is spreading.We feed her Pedigree at morning and night. we have now shifted to Drools. We plan to starting drools focus for puppies which is wheat,soy and corn free. here we dont really have much optionz except pedigree,Drools,Pedigree professional and Royal canin(very costly)
Hair loss or bald patches may be due to infections, parasites, hormonal disorders (usually symmetrical bald spots), allergies among others; one thing I will mention is if Riley sleeps on a heated pad, the heat may cause hair loss if he always lays on the same side (I had a strange case like that once). Apart from skin scrapings, examining hair (checking the hair present to see if it was licked - under microscope) and blood tests I cannot think of anything else to suggest. Regards Dr Callum Turner DVM
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