Atopic Dermatitis & Allergies

Also called: Canine atopic dermatitis, atopy, allergic skin disease, flea allergy dermatitis, FAD

• Dogs
• Skin & parasites
• Young adult onset

A chronic, itchy, inflammatory skin disease in genetically predisposed dogs, associated with environmental allergens; flea allergy dermatitis is a hypersensitivity to flea saliva. It is considered lifelong and is managed rather than cured. Signs usually begin between about 6 months and 3 years of age.

Signs to look for

• Itching — scratching, licking, or chewing
• Licking or chewing paws, belly, or tail base
• Face rubbing
• Recurrent ear and skin infections
• Flea allergy: lesions concentrated over the lower back and tail base

How a vet diagnoses it

There is no single definitive test. Diagnosis rests on history, compatible signs, and excluding other itchy diseases (fleas, mites, infection, food allergy). Your vet may use skin cytology, skin scrapings, a strict elimination diet trial, and allergy testing.

Treatment

Allergen avoidance where possible; year-round flea control; anti-itch medication (e.g. lokivetmab, a monoclonal antibody, or others); treatment of secondary infections; and allergen-specific immunotherapy — the only treatment that can modify the underlying immune response.

Monitoring at home

Lifelong. Flares are investigated for triggers (fleas, allergens, secondary infection) and controlled. Your vet will help find the most effective long-term plan.

Who tends to get it

Onset typically 6 months to 3 years, with recognised breed predispositions. Reported to affect roughly 10–15% of dogs (some reviews cite higher).

Sources

• Merck Veterinary Manual — Canine Atopic Dermatitis
• Cornell Riney Canine Health Center — Allergies