Dog Breeds That Have Relatively Uniform Physical Characteristics

Dog breeds are dogs that have relatively uniform physical characteristics developed by humans, with breeding animals selected for phenotypic traits such as size, coat color, structure, and behavior. Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.

Dog breeds are dogs that have relatively uniform physical characteristics developed by humans, with breeding animals selected for phenotypic traits such as size, coat color, structure, and behavior. Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.
Dog Breeds
Dog Breeds

First dog breeds

The domestic dog is the first species, and the only large carnivore, to have been domesticated. Over the past 200 years, dogs have undergone rapid phenotypic change and were formed into today's modern breeds due to artificial selection imposed by humans. The skull, body, and limb proportions vary significantly between breeds, with dogs displaying more phenotypic diversity than can be found within the entire order of carnivores. Some breeds demonstrate outstanding skills in herding, retrieving, scent detection, and guarding, which demonstrates the functional and behavioral diversity of dogs. The first dogs were certainly wolf like, but the phenotypic changes that coincided with the dog–wolf genetic divergence are not known.

Ancient dog breeds

Ancient breed of dogs was a term once used for a group of dog breeds by the American Kennel Club, but no longer.These breeds were referred to as "ancient breeds", as opposed to modern breeds because historically it was believed that they had origins dating back over 500 years. The study identified 9 breeds that could be represented on the branches of a phylogenetic tree. The dog which accompanied the ancestors of Native Americans from Siberia is extinct.

Dog types

The spread of modern dog breeds has been difficult to resolve because many are the products of the controlled breeding practices of the Victorian era (1830–1900). In 2010, a study looked at 48,000 single nucleotide polymorphisms that gave a genome-wide coverage of 912 dogs representing 85 breeds.

The study found that there were three well-supported groups that were highly divergent and distinct from modern domestic dogs. The three groups were

An Asian group (Dingo, New Guinea singing dog, chow chow, Akita and Shar Pei) that showed past admixture with Chinese wolves,

a Middle Eastern group (Afghan hound and Saluki), and
a northern group (Alaskan Malamute and Siberian Husky).

Basal breeds

In 2012, a study looked at 49,000 Single nucleotide polymorphisms that gave a genome-wide coverage of 1,375 dogs representing 35 breeds, 19 wolves, and previous published genetic signatures of other breeds, giving a total of 121 breeds covered. The study found a deep genetic split between old-world and new-world wolves, and confirmed the genetic divergence of 13 breeds from a 2010 study (Afghan Hound, Akita, Alaskan Malamute, American Eskimo, Basenji, Canaan dog, Chow Chow, Dingo, New Guinea singing dog, Saluki, Samoyed, Shar-Pei, Siberian Husky), plus another  the Eurasier, Finnish Spitz and Shiba Inu. 

Medical research

As dogs are a subspecies but their breeds are distinct genetic units, and because only certain breeds share the same type of cancers as humans, the differences in the genes of different breeds may be useful in human medical research.

A dog breeds is represented by a sufficient number of individuals to stably transfer its specific characteristics over generations. Dogs of same breed have similar characteristics of appearance and behavior, primarily because they come from a select set of ancestors who had the same characteristics. Dogs of a specific breed breed true, producing young that are very similar to their parents. An individual dog is identified as a member of a breed through proof of ancestry, using genetic analysis or written records of ancestry. Without such proof, identification of a specific breed is not reliable. Such records, called stud books, may be maintained by individuals, clubs, or other organizations.

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The Ultimate Revelation Of Dog: Dog Breeds That Have Relatively Uniform Physical Characteristics
Dog Breeds That Have Relatively Uniform Physical Characteristics
Dog breeds are dogs that have relatively uniform physical characteristics developed by humans, with breeding animals selected for phenotypic traits such as size, coat color, structure, and behavior. Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.
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The Ultimate Revelation Of Dog
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