The obvious reward for agility is the cookies in training, and the end-of-the-run routine. The not-so-obvious rewards that are sometimes forgotten is how excited you are to be working with your dog, how happy they make you by playing your game, and the unadulterated joy of running really, really fast.
Your dog doesn’t understand ribbons or Q’s, as such. They understand you, though. Make sure you give your dog the attention and praise they deserve, whether you are practicing, competing, or playing. Your dog is there for you, be there for them!