Two-way flea protection kills adult fleas and flea eggs before they hatch. Fleas are present year-round, even in colder climates. And once you see one flea, chances are there are many more flea eggs, larvae and adults that you haven’t seen.
Fleas can carry diseases to your pet. Fleas can transmit tapeworms and their bites can cause flea allergy dermatitis, the most common allergic skin disease of cats. If the infestation is bad enough, they can cause anemia, which can be fatal to kittens