Pursuing the Causes of Hair Loss

Allergic dermatitis is the most common culprit

With the exception of those bred for hairlessness like the Chinese Crested, dogs should have a full coat of hair. Whether it’s a short, tight coat,
a thick undercoat that sheds in the spring or long, coarse hair that guards soft under fur, when it begins to fall out, you’ll have to do some
detective work. That’s because the causes can range from external parasites to hormonal conditions to allergies, genetics and behavior problems.

Leading the list is flea-allergic dermatitis. It’s the most common cause of hair loss seen by Michael Stone, DVM, a specialist in internal medicine
at the Cummings School of Veterinary Medicine at Tufts University. “Fleas bite your dog and cause scratching from irritation, but many dogs also
experience flea allergy,” he said. “Those dogs will itch from the allergic reaction to the saliva of even one flea bite.”

Dogs with flea problems will usually have red skin and severe inflammation. You can see the fleas by pulling the hair back or rolling your dog
over and looking at the groin area. Fleas in the rump area may be more difficult to see, but one telltale sign is black specks. They’re dried flecks
of blood excreted by adult fleas.

Many dogs will show signs of secondary bacterial infections and may require antibiotics, other medications to ease the inflammation and itching, and
possibly topical treatments to kill the fleas. Treating a flea infestation means killing the adult fleas as well as the larvae in your house.

Other external parasites include mites – both the itchy sarcoptic mange mite and the ubiquitous demodectic, or red mange mite. Sarcoptic mange mites
make dogs miserable. They’ll itch almost incessantly. Veterinarians diagnose mites using skin scrapes. They’ll prescribe topical treatments, supportive
care and sometimes antibiotics.

Demodectic mites, present on many dogs, result in few problems, but when an overgrowth occurs in the hair follicles, patchy hair loss develops. “While
demodicosis is not usually itchy, if a secondary bacterial infection develops, itching may occur,” Dr. Stone said.

If you find a parasite on your dog, save it to show your veterinarian – and wait to bathe your dog until after his appointment. Important diagnostic
information may be lost in the bath.

While people with allergies tend to sneeze and wheeze, dogs often show skin problems, including hair loss secondary to inflammation and itching. Culprits
may he allergens in the air your dog breathes, his food or substances that get on the skin. Your veterinarian will work with you to determine the
offending substances and develop a plan to avoid them, and reduce reactions with medications or desensitization.

Some breeds have a genetic predisposition to hair loss. This may show up in certain color variants, such as the fawn or blue Doberman Pinschers. The
condition is called color dilution alopecia. The dogs aren’t usually itchy, but their haircoats become thin.

Breeds with thick, heavy coats are prone to hotspots. They’ll have inflamed areas without protective hair. The spots tend to occur in hot, humid
weather.

Sebaceous adenitis is an inflammatory skin condition leading to abnormal hair growth and/or hair loss. Poodles and Akitas are known to suffer from
it. A skin biopsy diagnoses the condition.

With any luck, however, your dog’s hair loss may simply he seasonal shedding, and his coat will be hack to its full glory in a short time.

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