Hair loss, or alopecia, in pets is a common concern that can have many underlying causes. While some shedding is normal, excessive or patchy hair loss may indicate a medical, environmental, or behavioral issue that requires veterinary attention. Identifying the cause early can prevent discomfort, reduce complications, and improve your pet’s overall well-being.

At Lebanon Animal Hospital in Lebanon, Tennessee, our veterinary team is dedicated to diagnosing and treating hair loss in pets, ensuring they remain healthy and comfortable.

Causes of Hair Loss in Pets

What is Alopecia in Dogs and Cats?

Alopecia refers to partial or complete hair loss in pets and may be accompanied by:

  • Itching and scratching
  • Redness, inflammation, or sores
  • Excessive licking or chewing at the skin
  • Dandruff, scabs, or foul odors

While some hair loss is temporary, persistent or worsening symptoms require veterinary attention to determine the underlying cause.

Read more about allergy-related hair loss in dogs.

Common Causes of Hair Loss in Dogs and Cats

Parasitic Infections

Fleas, mites, and ticks are common causes of hair loss and skin irritation. Pets with flea allergy dermatitis (FAD) are highly sensitive to flea saliva, meaning even a single flea bite can trigger intense itching, hair loss, and secondary infections.

  • Signs of flea infestation: Excessive scratching, red bumps, scabbing, and hair loss, particularly around the tail, belly, and inner thighs.
  • Mange (caused by mites) can lead to bald spots, thickened skin, and infections.
  • Ringworm (a fungal infection) causes circular patches of hair loss with flaky skin.

Learn more about year-round parasite prevention.

Allergic Reactions: Food, Environmental, and Flea Allergies

Pets can develop allergic reactions to flea bites, certain foods, and environmental allergens like pollen, dust, or household cleaning products.

  • Symptoms of allergies: Chronic itching, excessive licking, hot spots, and ear infections.
  • Food allergies can also cause digestive issues and skin inflammation.
  • Flea bite allergies lead to severe scratching, especially around the tail and back.

Explore allergy management strategies.

Learn more about flea allergy-related hair loss in cats.

Hormonal Imbalances and Endocrine Disorders

Diseases affecting hormone regulation can disrupt hair growth and cause patchy or widespread hair loss.

  • Hypothyroidism (common in dogs): Leads to thinning fur, weight gain, lethargy, and skin infections.
  • Hyperthyroidism (common in cats): Causes hair loss, increased appetite, and hyperactivity.
  • Cushing’s disease: Results in brittle hair, skin infections, and a pot-bellied appearance.

Genetic and Breed-Specific Hair Loss

Some dog and cat breeds are genetically prone to hair thinning or bald spots:

  • Doberman Pinschers – Prone to color dilution alopecia.
  • Chinese Crested & Sphynx Cats – Naturally hairless breeds.
  • Siamese Cats – More susceptible to psychogenic alopecia (stress-induced overgrooming).

Stress and Anxiety-Related Hair Loss

Overgrooming due to anxiety, boredom, or compulsive behaviors can result in bald patches, particularly on the belly, legs, and tail. Cats, in particular, may lick excessively in response to environmental stressors.

  • Common stressors: Moving homes, new pets, loud noises, or changes in routine.
  • Solutions: Enrichment activities, calming supplements, and behavioral therapy.

Diagnosing Hair Loss in Pets

Veterinary Diagnostic Approach

A comprehensive veterinary exam is necessary to determine the cause of hair loss. Diagnostic tests may include:

  • Skin scrapings and fungal cultures – To check for mites, ringworm, or bacterial infections.
  • Blood tests – To assess hormone levels and detect underlying diseases.
  • Allergy testing – To identify environmental or food allergens.
  • Biopsy or cytology – For persistent skin conditions or tumors.

Schedule a veterinary skin health evaluation.

Treatment Options for Pet Hair Loss

Medical Treatments

  • Parasite Control: Monthly flea and tick preventatives can eliminate infestations and prevent future skin irritation.
  • Allergy Management: Treatment may include antihistamines, special diets, or corticosteroids.
  • Hormonal Therapy: Pets diagnosed with thyroid imbalances or Cushing’s disease may need lifelong medication.
  • Antibiotics or Antifungals: Used if a bacterial or fungal infection is contributing to hair loss.

Home Care and Management

  • Grooming: Regular brushing removes excess hair, prevents matting, and promotes circulation.
  • Dietary Support: Omega-3 and Omega-6 fatty acids support healthy skin and fur.
  • Stress Reduction: Provide quiet resting spaces, interactive toys, and a stable routine to minimize anxiety-induced overgrooming.

Learn more about essential pet grooming.

Preventing Hair Loss in Pets

Routine Health Checkups

Annual veterinary visits help detect early signs of hair loss and prevent minor skin issues from worsening. Preventative care should include:

  • Year-round parasite prevention
  • Regular skin and coat evaluations
  • Routine bloodwork for endocrine disorders

When to See a Veterinarian

Seek veterinary care if your pet experiences:

  • Persistent itching, biting, or licking
  • Rapid or unexplained hair loss
  • Open sores, redness, or signs of infection
  • Lethargy or appetite changes alongside hair loss

Hair loss may indicate a serious underlying condition that requires prompt diagnosis and treatment.

Consult with our veterinary team.

FAQs About Hair Loss in Pets

Can hair loss in pets be reversed?

It depends on the cause. Parasite infestations, allergies, and infections are usually treatable, but genetic alopecia may not be reversible.

How long does it take for my pet’s hair to grow back?

Recovery time varies. Mild cases may resolve within weeks, while chronic conditions require long-term management.

Can diet affect my pet’s coat health?

Yes! A balanced diet rich in essential fatty acids and protein is key to maintaining a healthy coat.

Supporting Your Pet’s Skin and Coat Health

At Lebanon Animal Hospital, we provide comprehensive dermatological care tailored to your pet’s needs. Whether your pet is experiencing seasonal shedding, allergies, or an underlying medical condition, our team is here to help.

Schedule an appointment today.

By identifying the root cause of hair loss and implementing preventative care strategies, you can help your pet maintain a healthy, full coat and overall well-being.