Overview
Flea allergy dermatitis (FAD) is an allergic reaction to proteins in flea saliva. A single flea bite can trigger intense itching that lasts for days in sensitized pets. It's the most common cause of skin disease in dogs and cats. The key is that you may never see a flea — allergic pets groom so aggressively they remove the evidence. Even indoor pets can be affected.
Symptoms to Watch For
- Intense scratching and biting, especially at the tail base and hind legs
- Hair loss and red skin on the lower back and thighs
- Small, crusty bumps (miliary dermatitis in cats)
- Hot spots from self-trauma
- Restlessness and irritability
How Nutrition Helps
While nutrition can't prevent flea bites, omega-3 fatty acids reduce the inflammatory allergic response to flea saliva, lessening symptom severity. A strong skin barrier (omega-6, zinc) heals damaged skin faster. Supporting immune balance through proper nutrition helps modulate the overactive allergic response.
Prevention Tips
- Year-round flea prevention — no breaks, no gaps
- Treat ALL pets in the household, not just the one showing symptoms
- Wash pet bedding weekly in hot water
- Vacuum frequently to remove flea eggs
- Treat your yard if outdoor fleas are a problem