Origin of the domestic dog that was the most divergent group. The study found that the skulls of the "Goyet dog" and the "Altai dog" had some dog-like characteristics and proposed that the may have represented an aborted domestication episode. If so, there may have been originally more than one ancient domestication event for dogs as there was for domestic pigs. One theory is that domestication occurred during one of the five cold Heinrich events that occurred after the arrival of humans in West Europe 37 000, 29 000, 23 000, 16 500 and 12 000 YBP. The theory is that the extreme cold during
Dog type the written standard and awards are based on how closely the dog resembles the standard. Note 2. Many modern breeds of dogs still use the names of early types, although they may or may not resemble the old types. Note 3. Early attempts to categorize dogs as species of "Canis" are described by Carl Linnaeus in Systema naturae, 1758, Gmelin in 1788, Kerr in 1792. Dog type Dog types are broad categories of dogs based on form, function or style of work, lineage, or appearance. In contrast, modern "dog breeds" are particular breed standards, sharing a common set of heritable