oh yes a lot of dogs do that. Brock not only paws me, but he seems to think "speak" will always get him food.. lol And a lot of times when he REALLY wants the food he just runs through everything he knows; speak, roll over, sit pretty, etc.. It gets kinda crazy, I know what you mean.

Usually what I do is say "no" and then turn around ignore him for a few seconds until he calms down a bit. Usually he does calm down pretty fast. So you might want to try that, just ignore him, walk away, stop training, whatever, for about 30 seconds more or less, (you can decide on how long you think is enough, but it doesn't take long for dogs to get it) and he should learn pretty quick that if he freaks out he doesnt get the treat, since thats what you know he REEALLY wants.

Good luck, and have fun!