The idea of tiny insects feeding on the blood of your cat may make you shudder, but fleas are a very common problem. You can look for them or their droppings in a cat's coat, especially where the fur is pale. Other signs of a flea infestation are persistent scratching, crusty skin lesions, and thinning hair above the base of the tail. To eradicate fleas, you'll need to treat your cat, as well as your furniture, bedding, and rugs. A monthly flea prevention protocol is the gold standard for flea control. It not only kills fleas on your cat, but those in your home should eventually be eliminated as they fail to reproduce. Treat all pets in the home for this to be effective.