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Here’s something you probably didn’t know: There are more than 2,000 species of fleas. But the cat flea (Ctenocephalides felis) is the one most often responsible for the misery of cats and dogs. And for some pets, fleas are not only an annoyance, they are also a source of an allergic reaction called flea allergy dermatitis (FAD). A pet that is allergic to flea saliva might scratch and chew at flea bites, and eventually suffer skin inflammation, hair loss, and sores. In addition to attending whatever sores or infections have resulted from the bites, treatment involves removing fleas from the pet and the pet’s environment — and keeping them off the pet and out of the pet’s living and play spaces.