I would never block my puppy from his food in order to gain 'dominance'. You risk the dog becoming possesive with his food which could lead to aggression and serious biting.

Playbiting in puppies is not a 'dominance' issue. It is how puppies interact with the world. They need guidance on what is acceptable to bite, and what is not. When my 15 week stafford puppy starts to playbite my hand, I just say no, then immediately offer him a toy to bite instead. This is not, as some people think, rewarding him for biting, it is teaching him what he is allowed to bite. I make sure there are a variety of toys within easy reach in every room that Alfie has access too.

Alfie is much better with playbiting than he used to be, so I guess this method is working for us.

Good luck