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If you haven't already, talk to your vet about treatment options for your pet. These may include topical treatments, oral medication, or injections. These will kill the fleas on your pet and prevent reinfestation. Again, keep in mind that not all of these treatments work. Talk to your vet about the best treatment for your pets. This can kill the fleas that are currently on your pet, though it will not prevent them or do anything if there are fleas in the environment that jump back on to your pet. Look for a pet shampoo or dip that will kill fleas, larvae, and eggs.  Take extra care to wash your pet’s head after you've washed his body. Fleas might try jumping onto the head to avoid being washed. Be sure to follow the directions for use and frequency and completely rinse the product off of your pet.   DO NOT use dog shampoo or dips on cats. Keep in mind that these types of product will cleanse the pet, but they do not have persistent action to stop the pet from becoming reinfected. You must use another product (such as a spot-on treatment or collar) to prevent reinfestation. Flea sprays and powders, available at pet stores, are applied to the pet’s fur. They may need to be worked in to reach the skin to kill the adult fleas. Follow the instructions on the package for proper use. Flea control products are specially formulated for use on a certain type of pet. They are not interchangeable. Do not use a dog-formulated product on your cat, and vice versa.

Summary:
Administer flea medication obtained from your vet. Give your pet a flea bath or a flea dip. Try a spray or powder. Never use a dog product on a cat or vice versa.