You can use cat hair clippers on a cat, but never use grooming implements made for humans. Clippers made for people can trim too closely, pull hair or cause nicks and cuts, and they may be prone to overheating, too. Clippers made for cats are usually quieter, with a guard and blades made specifically for fur. Cat hair trimmers are designed to provide a safe and effective trim and they can help keep cats more relaxed during cuts, too.