Grooming a long-haired cat requires regular brushing to prevent mats and tangles in their fur. Use a slicker brush or comb to gently untangle any knots, starting from the tips of the fur and working your way towards the skin. Pay special attention to areas like behind the ears, under the armpits, and around the tail. Trim any excess fur around the paw pads to prevent matting. Regular grooming helps keep your long-haired cat's coat healthy and free of mats.