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Wolves can run fast but they're aren't very good at climbing and going extreme distances. Humans thrived because we could just keep going long past most creature's capacity before over-heating or giving in to exhaustion. Wolves were the closest thing to being a natural predator of mankind for a while, but we domesticated them and eventually even selectively mated specialized ones. In DayZ, you might see a pack of wolves track you, or charge / try to surround you (basic canine tactic) and if you're not armed it could spell disaster. A melee weapon might make one stop for a while or kill it - but if they're starving then you'll likely have to kill half the bunch before they run off to lick their wounds.