Medically Reviewed
By Dr. Jennifer Thompson, DVM, Board-Certified Veterinary Dermatologist
Hair Loss in Dogs: Understanding Alopecia
Hair loss (alopecia) in dogs can result from many causes including skin disease, infections, hormonal disorders, and self-trauma. Professional diagnosis is essential for proper treatment.
Veterinary Medical Disclaimer
This information is provided for educational purposes and is not intended to replace professional veterinary advice, diagnosis, or treatment. Always seek the advice of your veterinarian with any questions you may have regarding your pet's medical condition. Never disregard professional veterinary advice or delay in seeking it because of something you have read on this website.
Veterinary Evaluation Required
Unexplained hair loss requires professional diagnosis and treatment planning. Do not attempt to treat this condition without veterinary guidance.
Learn When to See a VetTypes of Hair Loss
Self-Induced Alopecia
Hair loss from scratching, licking, or chewing due to itching or pain:
- Broken hair shafts visible
- Often irregular patterns
- Usually accompanied by other symptoms
Spontaneous Alopecia
Hair loss without self-trauma:
- Smooth skin in affected areas
- Often symmetrical patterns
- May suggest hormonal or immune causes
Common Causes
Skin Disease
- Bacterial infections (pyoderma)
- Fungal infections (ringworm)
- Demodex mange
- Dermatophytosis
Allergies
- Atopic dermatitis
- Food allergies
- Flea allergy
Hormonal Disorders
- Hypothyroidism
- Cushing's disease
- Sex hormone imbalances
Other Causes
- Pressure sores
- Genetic conditions
- Immune-mediated disease
- Nutritional deficiencies
- Cancer
Diagnostic Approach
Identifying the cause requires:
- Thorough examination of pattern and distribution
- Skin scrapings for mites
- Fungal cultures
- Skin cytology
- Blood tests for hormonal issues
- Skin biopsy if indicated
When to Seek Care
Contact your veterinarian if hair loss:
- Develops progressively
- Affects multiple body areas
- Accompanies other symptoms
- Creates symmetrical patterns
- Doesn't regrow normally
Veterinary Evaluation Required
All skin conditions require professional veterinary evaluation for accurate diagnosis and appropriate treatment.
Learn When to See a VetKey Points
- Hair loss always has an underlying cause
- Pattern provides diagnostic clues
- Many conditions cause similar appearance
- Professional diagnosis is essential
- Most causes are treatable