Dog is known to be one of the first animal to be domesticated, and its not surprise because of the recent discoveries of a 33,000 years old dog skull. This ancient dog skull found in Altai Mountains of Siberia is consider as one of the oldest known evidence of of early domestication between the human and dog.

A researcher at the University of Arizona's Accelerator Mass Spectrometry Laboratory and co-author of a study reporting the find. According to them the find is domesticated based on morphological characteristics. Wolves have long thin snouts and their teeth are not crowded, and domestication results in this shortening of the snout and widening of the jaws and crowding of the teeth.

They also said that the interesting part of this is that we typically think of domestication on those times are for cows, sheep and goats, things that produce food through meat or secondary agricultural products such as milk, cheese and wool and things like that. They are probably providing protection, companionship and perhaps helping on the hunt.