Dog facts: 14,000 years of domestication and 450 breeds

Dogs have been part of human life for a very long time, and dog facts begin with an origin story older than agriculture. They were the first species to be domesticated, and the only large carnivore to be domesticated, making their history unusually close to our own.

Genetic studies suggest the domestication process may have begun over 25,000 years ago. Dogs and the modern gray wolf share a common ancestor, and dogs likely diverged from wolves between 27,000 and 40,000 years ago. A 2021 literature review inferred that the dog was domesticated in Siberia 23,000 years ago by ancient North Siberians.

Where did dogs first become domesticated?

Dogs were first domesticated over 14,000 years ago, before the development of agriculture. The domestic dog likely traveled a commensal pathway into domestication, meaning the relationship with people developed gradually over time.

The earliest remains generally accepted to be those of a domesticated dog were discovered in Bonn-Oberkassel, Germany. The remains of the Bonn-Oberkassel dog are the earliest to be conclusively identified as a domesticated dog.

How many dog breeds are there?

There are around 450 official dog breeds, the most of any mammal. That range includes the Great Dane and the Chihuahua, two breeds that show how extremely variable dogs are in size.

This diversity is one reason dogs stand out among domestic animals. Their bodies, behavior, and roles changed over time, but their place beside people remained constant across generations.

What makes dogs so different from other mammals?

Dogs have powerful jaws with about 42 teeth. They also have roughly 40 times more smell-sensitive receptors than humans, a trait that sets their sense of smell far apart from ours.

Those physical traits are part of why dogs became so closely tied to human communities. The domestic dog has been called man's best friend, and the species also became the most popular pet in the United States.

How common are dogs in the United States?

The dog is present in 34% to 40% of households in the United States. That makes it the most popular pet in the country.

From ancient Siberian origins to modern homes, dogs have moved through history as a companion species with extraordinary variety. Their story includes early domestication, a shared ancestry with wolves, and a level of breed diversity unmatched among mammals.

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