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Hair Loss in Dogs & Cats

Patchy or generalized loss of fur (alopecia). Can be caused by allergies, parasites, hormonal imbalances, or stress.

Common Causes

  • Allergies (food or environmental)
  • Fleas
  • Ringworm
  • Hypothyroidism (dogs)
  • Cushings disease
  • Stress/overgrooming (cats)

Red Flags

  • Circular patches (ringworm — contagious to humans)
  • Skin thickening or darkening
  • Symmetrical hair loss (hormonal)
  • Open sores
  • Rapid onset

When to See a Vet

If hair loss is progressive, patchy, accompanied by skin changes, or the pet is excessively itchy.

🐕 Hair Loss by Dog Breed

🐈 Hair Loss by Cat Breed

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