Any of about 400 described breeds of the species Canis familiaris (q.v.). According to the “breed barrier” rule followed since the mid-19th century, no dog may become a registered member of a breed unless both dam and sire are registered members. As a result, purebred dogs belong to a closed gene pool. Some popular breeds include terriers: Welsh, Bedlington, Dandie Dinmont, West Highland White, Skye, Cairn, Scottish, Sealyham, Fox (Smooth), Fox (Wire), Schnauzer, Airedale, Irish, Kerry Blue, Bull, Manchester. pointers: German Shorthaired Pointer, Irish Setter, English Setter, Gordon Setter, Weimaraner, Pointer, Brittany Spaniel. coursing hounds: Irish Wolfhound, Scottish Deerhound, Greyhound, Whippet, Borzoi, Saluki, Afghan. trailing hounds: Basenji, Bloodhound, Dachshund, Bassett, Beagle, Black and Tan Coonhound. miscellaneous hounds: Otterhound, Norwegian Elkhound. flushing spaniels: English Springer, English Cocker, American Cocker, Welsh Springer. retrievers: Golden Retriever, Labrador Retriever, Chesapeake Bay Retriever, Irish Water Spaniel, Curly-coated Retriever. sheep dogs: Briard, Kuvasz, Shetland Sheepdog, Collie, Belgian Sheepdog. sled dogs: Siberian Huskie, Eskimo, Samoyed, Alaskan Malamute. guard dogs: Bouvier de Flandres, Mastiff, Rottweiller, Boxer, Great Dane, Bull Mastiff, Schnauzer, German Shepherd, Dobermann Pinscher. miscellaneous working dogs: St. Bernard, Welsh Corgi (Cardigan), Welsh Corgi (Pembroke), Newfoundland, Great Pyrenees. toys: Maltese, Pug, Japanese Spaniel, English Toy Spaniel (King Charles), Pekingese, Pomeranian, Yorkshire Terrier, Griffon, Chihuahua, Papillon, Poodle (Toy), Mexican hairless. nonsporting breeds: Lhasa Apso, Poodle (Standard), Poodle (Miniature), Dalmatian, Chow Chow, Keeshond, Schipperke, English Bulldog, French Bulldog, Boston Terrier.
Subjects: Genetics and Genomics.