Flea Allergy Dermatitis diagramFlea Allergy Dermatitis (FAD) is an
allergic skin disorder, which occurs when a dog or cat is hypersensitive to flea saliva. When a flea bites a dog or cat it
injects it’s saliva into the animal, the flea’s saliva contains many antigens which some dogs and cats are very susceptible to. FAD is the most common allergy in dogs and is a very itchy and painful
condition. Your dog may not have many fleas, but it only takes one bite from one flea to trigger the allergic reaction.

FAD occurs most commonly in the summer months because this is when fleas are most prevalent. In regions with warm climates it can persist all year round. Where as cooler temperatures and low humidity tend to inhibit flea

What are the Symptoms of Flea Allergy Dermatitis?

Initially you may notice severe itching and inflammation of the skin. Your dog will then scratch and bite at the affected areas due to the discomfort resulting in damage to the skin, which may develop into circular, red painful sores called hot spots. These hot spots can occur anywhere but are most commonly seen along the back and at the base of the tail.

As the condition progresses there may be hair loss, broken hairs, oozing or crusty sores, pimply bumps and general redness and inflammation of the skin. The sores can be very painful. In severe cases the skin becomes
thickened and dark, predominantly in the area on the dog’s back at the base of the tail. The dog, itself, does the damage with self-mutilation due to the severe itching. Secondary bacterial and yeast infections are common in chronic cases of flea allergy dermatitis and you may notice an unpleasant odour coming from your dog because of this.

Above: dogs and cats suffering from flea allergy dermatitis
Above: dogs and cats suffering from flea allergy dermatitis





Are you starting to feel a little itchy and scratchy? Not sure if the fleas have started biting you ?

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