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Hair Loss in Dogs (Alopecia in Dogs)

What Is Alopecia in Dogs?

Alopecia, recognized as hair loss, is a prevalent condition among dogs. It distinguishes itself from shedding, a natural aspect of a dog’s hair growth cycle influenced by its breed. Alopecia manifests as either hair thinning or patches of baldness. The location of hair loss can vary depending on the underlying cause.


Symptoms of alopecia in dogs can vary depending on its underlying cause, which may include:

  • Mild to severe scratching, although sometimes there may be no scratching at all.
  • Skin that appears red, inflamed, thickened, oozing, bleeding, malodorous, or pigmented (black).
  • Presence of papules (red spots), pustules (pimples), plaques, or hives on the skin.
  • If parasites are the cause, they may or may not be visible. Fleas, ticks, and lice are visible to the naked eye, while mites and fungal elements like ringworm are not. Excessive scratching by the dog can lead to skin trauma and open wounds. Additionally, other areas such as ears and feet may be affected, especially in the case of certain allergies.


Alopecia in dogs can stem from various causes, some of the most common being:

  • Ectoparasites such as fleas, lice, mosquitoes, or mange mites like Demodex or Sarcoptes.
  • Incidents like spider bites or insect stings.
  • Skin infections, whether bacterial or fungal in nature.
  • Allergies, including those triggered by inhalation, contact, or insect bites.
  • Genetic predispositions such as atopy, which leads to allergic reactions or diseases.
  • Behavioral issues like anxiety or self-trauma due to underlying pain.
  • Autoimmune disorders.
  • Endocrine diseases like hyperadrenocorticism, hypothyroidism, seasonal flank alopecia, or those related to sex hormones.
  • Genetic factors like Alopecia X, color dilution alopecia, or specific breed susceptibilities.
  • Nutritional deficiencies resulting from starvation or an imbalanced diet.
  • Environmental factors such as exposure to outdoor, unclean, hot, or humid conditions.
  • Vaccine site alopecia.
  • Exposure to chemicals or burns.
  • Cancer.

Dog Breeds That Are Prone to Alopecia

Dog breeds that have a higher susceptibility to alopecia include:

  • Mexican Hairless and Chinese Crested breeds (considered “normal”).
  • Bulldogs, Dobermans, Yorkshire Terriers, Dachshunds, and Greyhounds due to genetic factors.
  • Nordic breeds like Siberian Huskies and Pomeranians may experience delayed hair regrowth after clipping.
  • Atopy-prone breeds such as Golden Retrievers, Labrador Retrievers, Bulldogs, West Highland White Terriers, and others.
  • Any breed, particularly puppies, with inadequate care is susceptible to Demodectic mange.


To diagnose alopecia in dogs, veterinarians conduct a comprehensive physical examination, which is crucial in identifying the underlying cause or causes of the condition. Given the complexity of skin disorders in dogs, there’s rarely a quick fix. Veterinarians consider various factors such as the dog’s age, breed, sex, overall health, and medical history to determine appropriate diagnostic measures.

Diagnosing alopecia requires understanding its root cause, as treatment options depend on this. Many cases of alopecia necessitate ongoing treatment, so being aware of this can prevent frustration if symptoms reappear.

During the veterinary consultation, pet owners should expect detailed inquiries about their dog’s history, covering aspects like diet, household pets, level of itchiness, past treatments, indoor/outdoor environment, activity level, parasite prevention measures, previous health issues, and exposures to various elements.

Upon gathering this information, veterinarians conduct a thorough examination of the pet, checking for signs of fleas, ticks, or areas stained with saliva, such as the feet, tail base, and flanks. They also pay attention to any unusual odors, as yeasty feet or ears can indicate specific issues. The texture of the dog’s skin helps determine appropriate topical treatments.

Based on examination findings, veterinarians may recommend various diagnostic tests, including:

  • Skin scrapings to check for Demodectic or Sarcoptic mange.
  • Cultures to identify bacterial infections.
  • Tape preps to detect bacteria, yeast, and inflammatory cells.
  • Black light examinations and fungal cultures for Dermatophytosis (ringworm).
  • Ear smears to assess for bacteria, yeast, cells, or mites.
  • Skin testing to evaluate allergies.
  • Food trials to investigate possible dietary triggers.
  • Blood tests to assess organ function and screen for endocrine diseases.
  • Fecal exams to detect parasites.
  • Biopsies to diagnose autoimmune diseases or cancer.


Treating alopecia in dogs hinges entirely on identifying its cause. In cases where it’s purely cosmetic or involves a small lesion, treatment may not be necessary. However, depending on the underlying issue, veterinarians may recommend one or more of the following:

  • Food trials
  • Medications such as antibiotics, antifungals, steroids, antihistamines, anti-parasitic drugs, or anti-inflammatory and anti-pruritic medications like Apoquel, Atopica, or Cytopoint injections
  • Topical therapies such as medicated shampoos, sprays, ointments, or dips
  • Surgical removal of affected areas
  • Other appropriate interventions

Living and Management

Recovering from and managing alopecia in dogs involves identifying and avoiding its underlying causes whenever possible. While this isn’t always straightforward, taking proactive measures can significantly help in managing your dog’s condition. This includes implementing effective flea control measures regularly, maintaining proper hygiene and grooming practices for your dog, and minimizing exposure to known allergens.

In case your dog experiences alopecia again in the future, it’s crucial to promptly seek veterinary attention to halt the progression of symptoms.

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