15–25 cm (6–10 in) coat. Short-haired (smooth coat) and long-coatColor. Any colour except merle (KC standard)Litter size. Apart from different types of Chihuahuas, breeders across the world started crossbreeding Chihuahuas with other dog breeds in order to create breeds of mixed traits. The result of crossbreeding Chihuahuas with other dog breeds such as Pomeranian dogs, Pembroke Welsh Corgis, Boston Terriers, Pugs and so on, usually ends up in a dog breed of a Chihuahua's body size and the other parent breed's coat color and fur traits. There are two varieties of Chihuahua recognised by the AKC and the UK Kennel Club – the Smooth Coat (smooth-haired) and the Long Coat (long-haired). The UK Kennel Club considers the two to be distinct breeds; mating between the two are not eligible for KC registration. The AKC considers Long and Smooth coated chihuahuas to be the same breed. Typically, the breed standard for both the Long and Smooth coat Chihuahuas will be identical except for the description of the coat.