Dog dog [3] (Canis Familiaris [1]) - domesticated species of a predatory mammal from the PSAY family (Canidae), treated by some systematic shares for a wolf subspecie [4] [5], and by others for a separate species [1], described Under Synonymous Names of Canis Lupus Familiaris or Canis Familiaris. Since its domain, many breeds have been created, significantly different to morphology and commercial features. The primary races were mainly created as a result of environmental pressure. Contemporary breeds were obtained as a result of artificial selection.
