Hello, thank you for your interest. For our feline friends, not shaving their fur is usually the best decision for their coat and skin health. If the matted fur isn't too severe, you don't need to shave your cat, as the fur protects your cat from both heat and cold, and you won't be considered late. Our product is specially designed to untangle knots and mats that occur in long-haired cats. The curved blades inside don't touch the skin, so they won't hurt your cat. However, if the hairs are completely embedded in the skin and have formed a tough plaque, forcing the comb through can cause discomfort due to pulling. For light to medium knots: By holding the knotted area from the root of the hair with your hand, you can easily untangle all knots without shaving, by combing gently and slowly from the tip to the root. Prevents hair from circulating again with regular use. We hope you have a nice day, sir.