Your doing well. I used to do that with Sam when he was a puppy, and he hasn't developed food aggression until recently. I think he learned it from Molli.

Molli is horribly food aggressive at times. As long as no one bothers her she won't snap. It's NO fun to deal with, better prevent it than let it start!

She's so young and still learning. Seems like your doing a great job with her so far!