How I read it was that you think the idea of teaching a dog everything that is off limits is absurb. Like how could the dog possibly know. And I thought about that and tried to remember how we taught Mac. I think that everything except toys and treats provided by you is off limits. Ya know what I mean? And he should be told "leave it" every time he puts anything in his mouth, unless you've given it to him. I know what you mean about picking your battles and sometimes it gets so tiresome to constantly be watching and trading your shoe for a raw hide
But the fastest way is consistency. On the other hand, I do think its annoying when people leave their stuff laying around with a puppy in the house and I hate it when people make comments. But thats because I get super defensive of my dogs too