Wolves as pets and working animals
Generally speaking, on the basis of their experience, tame wolves are strictly "one-man dogs". They may be confiding and playful with the man who raised them, or even with his whole family, if fed and cared for by them, but they are suspicious and timid in the presence of strangers. They invariably retain certain reactions of wolf nature, as for instance, an incorrigible desire to kill chickens or other small livestock whenever opportunity arises.
Evolution of the wolf
The domestic dog ("Canis lupus familiaris") is the most widely abundant large carnivore. Over the past million years, numerous wolf-like forms existed but their turnover has been high, and modern wolves are not the lineal ancestors of dogs. Although research had suggested that dogs and wolves were genetically very close relatives, later phylogenetic analysis strongly supported the hypothesis that dogs and wolves are reciprocally monophylic taxa that form two sister clades. This suggests that none of the modern wolf populations are related to the wolves that were first domesticated and the wolf ancestor of dogs is therefore presumed extinct. Recent mitochondrial DNA analyses of ancient and modern gray wolf specimens supports a pattern of population reduction and turnover. An alternate proposal is that during the ecological upheavals of the Late Pleistocene all of the remaining members of a dwindling lineage joined humans.