Understanding Hair Loss in Pets: A Guide for Dog and Cat Owners in Milpitas, CA

Pet owners in Milpitas, CA, often express concern when they notice their pets losing hair. Hair loss in dogs and cats can be distressing and may indicate underlying health issues. Understanding the causes, treatments, and prevention of hair loss is essential for maintaining your pet’s health and well-being.

What Causes Hair Loss in Dogs and Cats?

Hair loss, or alopecia, can result from a variety of medical and environmental factors. Some causes are minor, while others require immediate veterinary attention.

1. Allergies: A Common Culprit

Allergies are one of the leading causes of hair loss in pets. Triggers include:

  • Food allergies
  • Environmental allergens (pollen, mold, dust mites)
  • Flea allergy dermatitis (FAD) – an extreme allergic reaction to flea bites

Symptoms often include excessive scratching, skin irritation, and bald patches. When allergies are left untreated, they can cause chronic skin infections, leading to pain, inflammation, and persistent hair loss.

Learn more about dog allergies from the AKC and feline flea allergies from Cornell Feline Health Center.

2. Parasites: More Than Just an Itch

Fleas, mites, and ringworm are common parasites that can cause intense itching and fur loss. If left untreated, these infestations can spread, leading to secondary bacterial infections.

  • Fleas: Can cause flea allergy dermatitis (FAD) and transmit tapeworms
  • Mites: Lead to mange, which can cause scaly, red skin and severe hair loss
  • Ringworm: A fungal infection that creates circular bald patches

Severe parasitic infestations can also cause anemia, particularly in young or small pets. Quick intervention with veterinary-prescribed parasite prevention is critical.

Understand how parasites affect your pet’s skin and coat health at Advanced Veterinary Medical Center.

3. Hormonal Imbalances and Metabolic Disorders

Underlying medical conditions can lead to hormonal imbalances that affect hair growth. Common conditions include:

  • Hypothyroidism (common in dogs) – results in thin, brittle fur and lethargy
  • Cushing’s disease – causes excessive thirst, pot-bellied appearance, and hair thinning
  • Diabetes – can weaken the immune system, leading to skin infections and hair loss

Additionally, exposure to external hormone sources, such as topical hormone replacement therapy creams used by pet owners, can result in hair thinning and coat changes in pets. Dogs and cats exposed to human hormone treatments may develop abnormal fur loss patterns and other hormonal side effects.

Diagnosing these conditions typically involves blood tests to measure hormone levels. If untreated, hormonal imbalances can worsen over time, leading to organ dysfunction, metabolic issues, and chronic skin conditions.

4. Genetic Factors: Coat Color Dilution and Seasonal Hair Loss

Certain breeds are predisposed to genetic alopecia, including:

  • Color dilution alopecia (CDA) – common in blue or fawn-colored dogs such as Doberman Pinschers, Italian Greyhounds, and Great Danes. This genetic condition results in progressive hair thinning and fragile fur.
  • Seasonal flank alopecia – causes patchy hair loss on the flanks during colder months. It is most common in breeds like Boxers, Bulldogs, and Airedale Terriers.

These genetic conditions do not have a cure, but nutritional support, omega fatty acids, and specialized grooming can help minimize hair loss and maintain coat quality.

Diagnosing Hair Loss in Pets at Advanced Veterinary Medical Center

The Veterinary Diagnostic Process

To determine the underlying cause of hair loss, veterinarians at Advanced Veterinary Medical Center use a combination of:

  • Physical examination – Evaluates skin health and fur loss patterns
  • Skin scrapings – Detects mites, fungal infections, and bacteria
  • Blood tests – Identifies hormonal imbalances and systemic diseases
  • Allergy testing – Determines food or environmental triggers

Accurate diagnosis is crucial for developing an effective treatment plan. Delays in diagnosis can lead to prolonged discomfort and complications.

Book an appointment for a comprehensive exam.

Treatment Options for Hair Loss in Pets

1. Medical Treatments

Depending on the diagnosis, treatment may include:

  • Allergy management: Prescription antihistamines, steroids, or allergy shots
  • Parasite control: Flea, tick, and mite prevention
  • Antibiotics and antifungals: Treating bacterial or fungal skin infections
  • Hormonal therapy: Medications to regulate thyroid function or adrenal balance

2. Home Care and Prevention Strategies

Pet owners can take proactive steps to prevent hair loss and maintain skin health:

  • Regular grooming – Helps remove dirt, allergens, and loose hair
  • High-quality nutrition – A balanced diet rich in Omega-3 fatty acids promotes a healthy coat
  • Hydration – Ensures optimal skin moisture and prevents dryness
  • Routine veterinary check-ups – Detects early signs of allergies, infections, and systemic diseases

Learn why regular pet grooming is essential according to the ASPCA.

When to Seek Veterinary Care for Hair Loss

While some shedding is normal, pet owners should seek immediate veterinary care if their pet exhibits:

  • Rapid hair loss
  • Bald patches or open sores
  • Persistent scratching, biting, or licking
  • Lethargy or behavioral changes
  • Signs of infection (redness, swelling, foul odor)

If hair loss is accompanied by weight changes, increased thirst, or digestive issues, it may indicate a more serious underlying condition that requires urgent medical attention.

Contact Advanced Veterinary Medical Center for expert evaluation and treatment.

Close-up of a cat's lower body and front leg. The cat has a shaved belly area, exposing its skin, while the leg is covered in orange and brown fur with stripes. It stands on a patterned surface.

FAQs on Hair Loss in Pets

Why is My Pet Losing Hair?

Hair loss can be caused by allergies, parasites, infections, hormonal imbalances, or poor nutrition. A veterinary consultation is essential to determine the cause.

How Can I Prevent Hair Loss in My Pet?

Preventative steps include regular grooming, a balanced diet, parasite control, and routine vet visits. Keeping your pet’s living space clean can also reduce exposure to allergens and irritants.

Is Hair Loss in Pets Always Serious?

While seasonal shedding is normal, excessive hair loss, bald spots, or inflamed skin are red flags that should be addressed by a veterinarian.

Visit Advanced Veterinary Medical Center for Hair Loss Concerns

If you’re concerned about hair loss in your pet, schedule an appointment today. Early detection and treatment can prevent complications and keep your pet’s coat healthy for years to come.

Book a Consultation at Advanced Veterinary Medical Center.