If you see your cat scratching often and persistently, it’s time for a spot check. Invest in a fine tooth comb and run it through your cat’s fur, especially around the neck and at the base of the tail. If you see small, fast-moving brown shapes about the size of a pinhead in her fur, your cat has fleas. Also check for black spots in between the teeth of the comb. The black spots are called “flea dirt”–dried blood excreted by fleas. And if you see tiny white grains, these may be flea eggs.