Although dogs have variable genetically based features, and members of a single litter may be born with the marked diversity, the variation in size, shape and color of domesticated dogs is almost entirely the result of artificial breeding and selection. The American Kennel Club recognizes 130 breeds, grouping them as sporting dogs, examples are pointers, setters and retrievers. We have the hounds, examples are bassets, bloodhounds and foxhounds. The working dogs, examples are boxers, malamutes and schnauzers. The terriers, which are bull, fox, Scottish as examples. The toys, example, the chihuahuas, pugs and Pomeranians. The non-sporting dogs, which are the bulldogs and dalmatians. And lastly the herding dogs, examples of this are the collies, sheepdogs and corgis. The American Kennel Club registers more than 1.2 million purebred puppies per year. In a recent year, the poodle and the cocker spaniel ranked highest in number of puppies registered. Mixed breed dogs are not eligible for registry. The British Kennel Club lists about 170 breeds; the Federation Cynologique Internationale, with 65 member countries, lists 335 breeds. In the United States the number of dogs, both purebred and mixed-breed, is variously estimated to range up to 50 million.
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