Flea Allergy Dermatitis in Cats VCA Animal Hospitals.
Fleas can cause intense pruritis in cats who develop an allergyor hypersensitivityto proteins found in flea saliva. Cats are exposed to these proteins when fleas bite them. This condition is known as flea allergy dermatitis (FAD).

If your cat is allergic to fleas, they will develop intense itching and a rash every time they are bitten. A rash, hair loss, constant scratching, and skin infections are all common symptoms of a flea allergy. Flea allergic dermatitis can develop at any point throughout your cats life.

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Causes of Flea Allergies in Cats. Cat is itchy from fleas. Flea allergies in cats only happen from flea bites. The mere presence of a flea wont cause a reaction, but it would be very rare for a flea to land on your cat and NOT try to take a bite.

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What Causes Allergies In Cats? Some of the most common causes of cat allergies includeAccording to Dr. Little, most cats with food allergies become allergic to the protein in their food. For example, they may develop an allergy to chicken, beef, or salmon.
Fleas cause discomfort to the pet, are the cause of flea allergies and flea anemia, and can transmit Dipetalonema reconditum (heartworm look-a-like microfilaria), Hemobartonella, and tapeworms, as well as other diseases in pets. Haemobartonella In Cats.