Provecta Advanced for cats (Small/Over 9 lb ) is a two-way flea protection kills adult fleas and flea eggs before they hatch. Fleas are present year-round, even in colder climates. And if you see one flea, there's a good chance many more fleas, larvae and eggs are nearby. Stopping fleas before the 2nd stage of their lifecycle is important in making sure your pets are protected. Provecta for Cats destroys eggs before adult fleas can even become a problem.