Dog

Differences from wolves
• Physical characteristics
Compared to equally sized wolves, dogs tend to have 20% smaller skulls, 30% smaller brains, as well as proportionately smaller teeth than other canid species. Dogs require fewer calories to function than wolves. It is thought by certain experts that the dog's limp ears are a result of atrophy of the jaw muscles. The skin of domestic dogs tends to be thicker than that of wolves, with some Inuit tribes favoring the former for use as clothing due to its greater resistance to wear and tear in harsh weather. The paws of a dog are half the size of those of a wolf, and their tails tend to curl upwards, another trait not found in wolves.