My 2 1/2 year old 100 pound intact male wolf mix, Cujo has just recently began nipping at people. Never me, he loves me.
They loved this lady too, till the day that one of them decided it was time to become Leader of the Pack. Of course, with a single wolf/dog, pack behavior isn't as likely to appear as it would be if there were a group IMHUEO (In my humble uneducated opinion).