I see what you mean. When I have dogs i stick my hands in their food whatever. This starts when they are a puppy. I can be hard sometimes. Any growling at me etc would end up getting a quick pop and a hard eye to eye stare down. They won't let each other near their food, but I do what I want almost daring them to do something. How much of that is genetic temperament. How much of that is house dog training. I don't know. I try not to break them, but let them know the rules and quick reminders if they break them starting from day one. Like I'm an athletic person that likes athletic dogs. There are some aspects of this I have to defer to people for. I need dogs that can walk the woods, run by a bike, companionship etc. All the dogs I have had are game bred from good stock from good kennels. Just things I think about. I have not bred a dog. I feel old rules should govern that for the most part. Just my two cents.