I have two long hairs..Glacier and Onyx. They have completely different types of coats. Glacier rarely needs to be brushed and doesn't get mats. I brush him about once a week, just because he likes it! Onyx is double coated. Under his solid black coat is a silky soft layer of silver fur. He gets terrible mats and needs to be brushed several times a week. He is tolerant for a few minutes and then attacks my hand!