Depending on the breed of your dog and the length of your dog's hair, mats can appear in the coat for a variety of reasons. For the health, well-being and comfort of your dog, regular coat checking and grooming will reveal mats in your dog's coat. Mats are easier to remove if they are dealt with early before they get too big. The bigger the mat, the more uncomfortable they are for your dog and the more difficult they are to remove. So regular grooming of your dog's coat is recommended, especially if you have a long-coated breed or breed with an undercoat. However, in the event of a mat appearing, the Kazoo Dematter tool can help.