[header] How to deal with persistent feline flea problems [title] Look for flea dirt. [step] Flea dirt resembles small specks of ground black pepper. Look for these specks along your carpet and floor, especially in the areas where your cat rests. 
If you see the black specks, rub them with a damp, white cloth. If tiny red specks appear on the white cloth, then this is a sure sign that you have a flea problem.