My dog is so motivated to get the treats, he’s not paying attention to me… he’s desperate for the food. Am I doing something wrong?

I bought your marker training dvd and started doing the training a few weeks ago. I'm having trouble because Kasey is soooo motivated to get the treats, that I don't feel that he's paying enough attention to me and what I am asking him to do. He was already trained in sit, down, stay, etc. before I started marker training. So I started with tricks like wave, play dead, high 5 - he learned those quickly because they were easy and now that I am starting to use it to teach serious things like 'watch me' and 'heel', he is so desperate to get the food, that he's not really paying attention to what I'm wanting him do. Instead he gets all riled up and starts doing all the tricks he's ever learned in an attempt to get the treats! You should see him, he falls to the ground dead, rolls over, waves, does high 5, etc. all within 30 seconds! I've tried using different kinds of treats and just plain old cooked chicken (he eats raw), but it doesn't matter what I use, his focus is on that food. He also loves balls, so using toys seems to do the same thing.

Any suggestions? Maybe it's me and I'm doing something wrong?