You can also use peanut butter.not a lot but a 1/4 teaspoon on a plate that you can deliver on the end of your finger is a very high value reward. Just swipe a bit on your finger and let the dog lick it off. Your dog will learn and you will begin to take him with you to more places and more fun places. These are the "environmental" rewards that you allow the dog to enjoy by being in control of the dog's environment.