It is believed that sled dog breeds (northern, hunting) are direct descendants of the primitive (oldest) dogs of Asia and Europe. It is possible that their origin is associated with wolves. Sled dogs were indispensable helpers and companions of polar explorers. It is believed that without them it would hardly have been possible to make some geographical discoveries in the Arctic. So, for example, the two poles of the Earth were conquered by teams of dogs. It is likely that there were few expeditions in which there were no dogs.
For a day these dogs can walk trot seventy kilometers. They have very strong paws. Exceptional physical endurance and unpretentiousness are the main advantages of harnessed dogs, which have been developed for hundreds of years under heavy physical exertion, on long trips on ice and snow.
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