Though groups like the American Kennel Club make very specific designations about breeds and breed hybrids, there continue to be new breeds and breed variants developed all the time, as well as "up and coming breeds" not officially recognized by kennel clubs and experts. (Many dogs not purchased directly from breeders are also mixed-breeds of some kind, or have less than purebred ancestry.)
The study found distinct genetic clusters within modern dogs that largely corresponded to phenotype or function. These included spitz-breeds, toy dogs, spaniels, Mastiff-like breeds, small terriers, retrievers, herding dogs, scent-hounds, and sight-hounds. There were 17 breeds that conflicted with phenotype or function and these were thought to be the result of crossing some of the other phenotypes. As in a 2004 study that found 9 ‘ancient breeds’ to be genetically divergent, the study found 13 breeds that were genetically divergent from the modern breeds: the Basenji, Saluki, Afghan hound, Samoyed, Canaan dog, New Guinea singing dog, dingo, Chow Chow, Chinese Shar Pei, Akita, Alaskan malamute, Siberian husky and American Eskimo dog. Results also indicated that the Basenji had recent admixture with Middle Eastern wolves.
Today some of these jobs are performed in other ways and dogs don’t do the work they used to do. Hunting is a sport today and most of us don’t have to hunt with dogs to put food on the table. English Cocker Spaniels and Irish Setters are more popular as family pets than as hunting dogs. Dogs aren’t commonly used to kill rats today and it’s been a long time since the adorable Yorkshire Terrier, originally bred to kill vermin in textile mills, was used for this kind of work. Dogs still have some specialized uses for search and rescue, narcotics detection and other kinds of detection, along with other specialized skills such as therapy dog work, but most people don’t need to use dogs for work. Nevertheless, breeds still have their admirers. Some people love a dog’s appearance. Some people love a breed because they are from the same tiny corner of the world and they feel a kinship with the dogs of their ancestors. Some people love the temperament of a certain breed or its athletic ability. There are all kinds of reasons why people love a particular breed.
List of favorite dog breeds, mainly gauged by the animals suitability as pets in homes and apartments. Because of thousands of years of selective breeding by humans, dogs come in a tremendous variety of sizes, shapes, colors, temperaments and behaviors. They are the only animal to have so much variation in appearance without branching into a separate species.