Flea allergy dermatitis is an allergy, more specifically, a hypersensitivity reaction against the proteins in the fleas saliva. The dogs immune system causes an inflammatory reaction, leading to intense itching and scratching.
Learn about the veterinary topic of Flea Allergy Dermatitis in Dogs and Cats. Find specific details on this topic and related topics from the Merck Vet Manual.
Flea allergy dermatitis is an allergic reaction caused by proteins found in flea saliva. When a flea bites your pet, it injects saliva into the skin, which can trigger an intense immune response in some animals.

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Fleas; parasites; dogs; flea hypersensitivity; flea allergic dermatitis are some of the most common skin conditions in dogs.Other clinical signs of flea allergic dermatitis include hair loss, secondary skin infections and itchiness over the hips and backs of the thighs.
Flea allergy dermatitis (Flea bites). Intense itching, often around the base of the tail, belly and inner legs. You may see red bumps or flea dirt.They can be a godsend for dogs with chronic atopic (environmental) allergies.

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Flea Allergy Dermatitis (FAD) is one of the most common allergic skin conditions in dogs. It is not caused by the fleas themselves, but by a hypersensitivity reaction to flea saliva. Even a single flea bite can trigger intense itching in sensitized dogs. .