There is much speculation but little evidence about why canids came to live with or near humans, possibly as long as 100,000 years ago. With the beginnings of agriculture around 12,000 years ago, humans began making use of dogs in various ways, resulting in physical differences between dogs and their wolf ancestors. In earlier times, little was written about dogs, although there were known dog types or landrace dogs, which developed over time with minimal human intervention, to fit in with the environment (including human culture) in which the dogs lived or live. Dog breeds in the modern sense date only to the accurate documenting of pedigrees with the establishment of the English Kennel Club in 1873, in imitation of other stud book registries for cattle and horses. breeds dog.

Many dog breeds today have names of original landrace types, such as the Border Collie. Other landrace types, such as retrievers, have been made more uniform in appearance through selective breeding, and developed into a variety of distinctive breeds. Varieties of purebred dogs kept for working purposes can vary in appearance from purebred dogs of the same breed kept as showdogs and pets. breeds dog.

New dog breeds are being continually created. They are either accidentally or purposely crossbred from existing breeds, developed for a specific style of work, or created just for marketing purposes. Recently discovered semi-feral and landrace types such as the New Guinea Singing Dog have been documented and registered as breeds for purposes of preservation. The Canadian department of agriculture has strict standards for the documenting of what it calls "emerging breeds". Many registries which require minimal documentation are available for registering new and existing breeds of dog. In general, a dog can only be guaranteed to be of a specific breed if it is documented in the stud book of a major dog registry or breed registry. breeds dog.

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