Why Dogs Can Be Tamed But Wolves Cannot -- Science 2.0
Wolves and dogs are genetically very similar, so why did dogs become "man's best friend" while wolves remain wild? Kathryn Lord at the University of Massachusetts Amherst suggests the different behaviors are related to the animals' earliest sensory experiences and the critical period of socialization.
Not much is known about sensory development in wolf pups and assumptions are usually extrapolated from what is known for dogs - but there are significant differences in early development between wolf and dog pups, chief among them timing of the ability to walk.
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My Comment: Bottom line .... wolves are tricky animals to have as a pet.