If your pet has visible fleas on their body then you should give it a flea bath. This is usually the first attack that can be tried on your pet. If your pet is cat then you will have a hard time trying to bath it. Make sure that you understand how you can use the medicated shampoo so it can get rid of the fleas effectively. You should also be aware that a flea shampoo is not an effective method of controlling fleas. Most people are usually surprised to see fleas on their pets after a week of bathing. These types of pet meds are meant to last a day or even less.