The poodle has been bred in at least three sizes, including Standard, Miniature, and Toy. According to the American Kennel Club, which recognized the breed in 1887, the Standard Poodle is the oldest of the three varieties, and was later bred down to the miniature and toy sizes. The British Kennel Club also recognizes three sizes, stating that the miniature and toy are scaled down versions of the standard. Despite the Standard Poodle's claim to greater age than the other varieties, some evidence shows the smaller types developed only a short time after the breed assumed the general type by which it is recognized today. Unlike most dogs, which have double coats, poodles have a single-layer coat (no undercoat is present) composed of dense, curly fur that sheds minimally. They  could be considered hypoallergenic (though not completely allergen free). The poodle does shed, but instead of the fur coming off the dog, it becomes tangled in the surrounding hair.