There's a guy with a few wolf dogs who frequents a dog park near me. They're great and beautiful animals, but according to him you have to dilute the wolf in them for multiple generations before they become safe to keep as pets. I guess training a wolf is technically possible but wolves and half-wolves just aren't domesticated animals and they can and will react unpredictably no matter how "well behaved" they seem on the surface - and that's with a professional working with them, now imagine the average dog owner!