Are you training while he's hungry? Some dogs ignore treats if they're full from meals. And yeah, lots of people have success training with normal dry food; you just have to hold back a portion of his meal to train with throughout the day so he doesn't get too much food overall.
If he's not into food during training at all, you need to figure out what motivates him and use that as a reward instead. Does he go crazy over any type of toy, maybe something that squeaks?
If he's not into food during training at all, you need to figure out what motivates him and use that as a reward instead. Does he go crazy over any type of toy, maybe something that squeaks?