[header] How to tell if your cat grooms excessively [title] Look for missing fur. [step] If your cat over grooms, it will be missing strips of fur on its body. These missing strips are most likely to be on your cat's belly or back. 
Some cats will groom at the change of seasons, so your cat's fur might be shorter in some areas at this time. Over grooming often results in bald spots, however.