Mutt origin: where the word and the mixed-breed dog came from

Part 1

What mutt actually means

Mutt and mongrel both point at roughly the same kind of dog, but they carry different weight. Mongrel traces to a mid-15th century word for mingling, and by the 1590s people were already using it to insult humans as well as animals. Mixed-breed is another term used for this same kind of dog.

A purebred dog is bred toward a written standard kept by a kennel club, so its line can be followed through a stud book.

Part 2

Where the word mutt comes from

The word mutt began as a term for a foolish person, not a dog. It is a shortened form of muttonhead, American slang recorded in 1803 for a dull or stupid person, built from mutton plus head. Mutton itself comes from an old word for sheep, and muttonhead borrowed the old idea that sheep are foolish animals.

Mutt is recorded by 1898 describing a dog, especially a not-very-bright one, and a related sense, a foolish person in general, is dated to 1901. Its first written use overall is often dated to 1899. By 1910, dog fancier publications were using mutt specifically for a non-purebred animal.

Part 3

Dogs before breeds existed

Before formal breed standards existed, dogs were not sorted the way they are today. Before formal standards existed, many different types of dogs existed, and people described them with a loose mix of words like breed, strain, type, and kind. Sled dogs on Zhokhov Island were bred toward a size suited to pulling sleds around 9,000 years ago, and greyhound-type and mastiff-type dogs were already recognizable in Egypt and Western Asia thousands of years later, long before anyone wrote down a breed standard.

Part 4

How Victorian breed clubs created the divide

Most modern dog breeds came out of the controlled breeding of the Victorian era, roughly 1830 to 1900, and the accurate documenting of pedigrees began with the founding of the Kennel Club in the UK in 1873, the world's first national kennel club and breed registry. In the United States, the Field Dog Stud Book has kept pedigree records dating back to 1874. Kennel clubs maintain breed standards, written descriptions of what an ideal dog of each recognized breed should be.

Part 5

What research says about mixed-breed dogs today

Today there are upward of 360 recognized dog breeds around the world.

Part 6

Common myths about mutts

A purebred dog's lineage can be documented for generations through registries such as the Field Dog Stud Book, whose records date back to 1874.