The domestication process began approximately 10,000 years ago and dogs still maintain some behaviors from their wild ancestors the wolf. Wolves have an incredible strength and endurance. Their jaws are powerful enough to crack open the femur bone of an adult bison. They can trot for hours, easily covering 50 miles a day. And they can reach speeds of 40 miles per hour.
Wolves also have a superior sensory mechanism.
Their hearing is acute and their vision detects movement long before human eyes. Their nose makes them very efficient predators and helps them decipher the differences between strong, healthy animals and weak vulnerable prey. Wolves feed on large animals such as moose, deer, elk, caribou, bison, and musk oxen. Pray animals are not defenseless. These large animals can be four times larger than a wolf and capable of fracturing wolves' bones during a fight.