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Dog breeds are dogs that have relatively uniform physical characteristics developed under controlled conditions by humans, with breeding animals selected for phenotypic traits such as size, coat color, structure, and behavior.

In 2017, a study showed that 9,000 years ago the domestic dog was present at what is now Zhokhov Island, arctic north-eastern Siberia, which was connected to the mainland at that time.

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.

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At death, the heads of the dogs had been carefully separated from their bodies by humans, probably for ceremonial reasons.

Archaeology has revealed dog remains of various sizes but there does not appear to have been distinctive breeds until 3,000-4,000 years ago when greyhound-type dogs were depicted on pottery and paintings in Egypt and Western Asia.

Kennel Clubs maintain breed standards, record pedigrees in a breed registry (or studbook), and issue the rules for conformation dog shows and trials and accreditation of judges.

They often serve as registries, which are lists of adult purebred dogs and lists of litters of puppies born to purebred parents.

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.

In 2004, a study looked at the microsatellites of 414 purebred dogs representing 85 breeds.

The study found that dog breeds were so genetically distinct that 99% of individual dogs could be correctly assigned to their breed based on their genotype, indicating that breeding barriers (pure-bred breeding) has led to distinct genetic units.

Dog breeds proliferated in Europe during the Middle Ages 700 years ago.

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