For hundreds of years, humans have bred dogs to selectively enhance certain behavioral and physical traits. Some crossed two different types of dogs to intensify their hunting or guarding capabilities, while others worked to refine a certain breed’s companion traits. All these crossbreeding efforts have led to some major changes in canine appearance over the years. Some breeds we know and love today look very different from what they did 100 years ago.

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1. Siberian Husky

There was no breed standard when the first Siberian Huskies arrived in North America in 1908. Some had heavier builds, while others were leggier and taller. Today, Siberian Husky breeders stick to specific standards and the breed is highly recognizable. The most famous Siberian Husky was the black-furred Balto, a three-year-old that led a team of sled dogs in the 1925 Serum Run. The team transported a diphtheria serum on a treacherous journey from Nenana to Nome, Alaska.

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balto sled dogs siberian husky Sergeeva / Getty Images
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Samoyed Dogs of All Nations / archive.org
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