It is normal for Teddy's hair not to be curly when he is a puppy. During the puppy stage, Teddy's hair is sparse and soft, and the curls are relatively large. It usually starts to curl up when he is four months old. At this time, Teddy will start to change hair. Lanugo, the new hair that grows out is relatively curly, and it will be replaced at about nine months of age. If the new hair is not curly, it means that Teddy is not a purebred.