Dogs, on the other hand, have been bred as companions to humans to approach them, to enjoy their presence. When wolf behavior starts to take place among humans, it causes massive and sometimes tragic problems. On the small scale, there's the destructiveness. Wolves dig tremendous holes in yards, they tear apart homes out of sheer curiosity, they mark their territory with foul-smelling urine, and they're smart enough that a fence may not hold them in a yard. At worst, there's the aggression.
Wolves are animals that hunt for food.
A running child, a sudden wrong movement on the part of the owner can trigger that predatory impulse. Wolf society is based on dominance and constant testing if you back down, the wolf has moved up in rank. The alpha wolf is constantly being tested by the second-ranking wolf. It's a constant, instinctive jockeying for position. Wolves are animals that hunt for food.