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12-Aug-2017 03:30

The same standard has been found in the remains of sled dogs from this region 2,000 ago and in the modern Siberian Husky breed standard.

Other dogs were more massive at 30kg and appear to be dogs that had been crossed with wolves and used for polar-bear hunting.

The study identified 9 breeds that could be represented on the branches of a phylogenetic tree which grouped together with strong statistical support and could be separated from the other breeds with a modern European origin.

These 9 breeds had been referred to as "ancient breeds", as opposed to the modern breeds.

A dog breed is represented by a sufficient number of individuals to stably transfer its specific characteristics over generations.

The optimal maximum size for a sled dog is 20-25kg based on thermo-regulation, and the ancient sled dogs were between 16-25kg.Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.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.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.

The optimal maximum size for a sled dog is 20-25kg based on thermo-regulation, and the ancient sled dogs were between 16-25kg.

Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.

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.

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 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.