Using food as a reward is just the start because most dogs will work for a treat. However, many of us also use toys, freedom, praise, petting, play, etc., as rewards are our dog’s progress in their training. You will not have carry treats with you 24/7 to get your dog to mind – if that were true no positive reinforcement trainer would be able to compete in dog events, where food is not allowed. And many compete, successfully at that.