I doubt typical (domestic) dog would last very long out on its own?
Dogs arent to bright and would probably get hit by a car, they also cant catch, mice, birds, squirrels, rabbits etc to survive.
What if I got a mountain lion would that be allowed to wonder around at will?
There are good reasons that you cant do this, and you know it, its not as though tiddles goes round savaging small children is it?