There could be many reasons why your dog might experience hair loss. These reasons range from allergies and seasonal shedding to more severe reasons like alopecia. Today, our Los Angeles vets what causes patches of hair loss in dogs.

What Causes Dog Hair Loss?

There can be many reasons why your dog might have patchy hair loss. These include regular, seasonal shedding, mange, fleas or other kinds of mites, and even hormonal changes. Of course, there is also alopecia to be careful of too.

Seasonal Shedding

Brushing your dog twice a week can aid in the removal and reduction of unwanted hair. Dogs shed their fur when their hairs become worn or damaged, or when the weather warms up. For example, huskies and labradors have thick winter undercoats that they shed in the spring. Seasonal shedding is frequently reduced if you live in a temperate climate.

Bacterial Infections

Dogs, like humans, can develop bacterial or fungal skin diseases. Pyoderma is a bacterial skin infection that is most noticeable when the skin is red and pus-filled. Candida infections, also known as yeast infections, occur when the yeast that is always present on a dog's skin overgrows. Ringworm, also known as tinea, is a fungal infection that causes dry skin and damaged hair in circular areas.


Mange is a term that refers to itchy skin conditions caused by mites. Mites are microscopic organisms that live on the surface of the skin or in hair follicles. Scabies mites, for example, are highly contagious to humans and other dogs. If you find mites or fleas on your dog, consult your veterinarian about an antiparasitic treatment.


Dogs, like humans, can develop allergies, with itchy skin and hair loss being the most common symptoms. The most common allergies in dogs are to irritants such as pollen, mold, dust mites, flea allergies, and food allergies. However, dietary allergies can only be detected after at least eight weeks of food trials.

Other Medical Conditions

Excessive shedding can be caused by stress, poor diet, pregnancy, nursing, or any underlying medical condition. A dog who is losing hair should see a veterinarian, even if his illness is usually treatable with a simple diet or medication change. They will recommend dog hair loss therapy based on your pet's other health needs.


Alopecia is a relatively common condition. It refers to either thinning hair or areas of hair loss (bald spots). This is distinct from shedding, which is a natural part of your dog's hair development cycle and varies by breed.

Symptoms and Causes of Alopecia

Depending on the cause of alopecia, symptoms can include:

  • Mild to severe scratching
  • Skin that is red, inflamed, thickened, oozing, bleeding, malodorous, or pigmented
  • Skin with papules

Likewise, there are numerous causes of alopecia, which include:

  • Ectoparasites and bug bites
  • Skin infections and allergies
  • Genetic predispositions
  • Autoimmune disorders Endocrine diseases
  • Environmental causes
  • Nutritional causes

Breeds Susceptible to Alopecia

Mexican Hairless, Chinese Crested, Bulldogs, Dobermans, Yorkshire Terriers, Dachshunds, Greyhounds, Siberian Huskies, Pomeranians, Golden and Labrador Retrievers, and West Highland White Terriers are among the dog breeds predisposed to alopecia.

Further, any breed with poor husbandry, especially puppies, is at risk for mange.

How to Stop Dog Hair Loss

Checking for fleas in the house, ruling out mange, and keeping your dog calm may help prevent hair loss. You should also consider the type of dog food they are eating, and if the symptoms are mild, you should investigate hypoallergenic dog food options. If you don't notice any improvement, consult your veterinarian to rule out any more serious conditions.

If you're concerned about your dog's hair loss, contact our Los Angeles vets today for professional advice.