What do you do when you're dog goes on food strike because he absolutely hates his food? You go to Petsmart and find the one employee in there who literally knows everything about the 8 million brands of dog food spread across four daunting aisles.
I was lucky enough to find that one person, who was beyond willing to help me. She spent quite a bit of time understanding what my dog needs, and explaining the differences between the different types of food (and how everything was sorted...apparently there's regular food, science food, holistic food). I'm happy to report that my dog is somewhat off food strike because I found a healthy food that he moderately likes.
The staff isn't going to seek you out, so go find someone in the store and they will be more than willing to help you.