Robert Crais said this quote
“ The best dog training was based on the reward system. You did not punish a dog for doing wrong, you rewarded the dog for doing right. The dog did something you wanted, you reinforced the behavior with a reward - pet'm, tell'm they're a good dog, let'm play with a toy. The standard reward for a K-9 working dog was a hard plastic ball with a hole drilled through it where Leland liked to smear a little peanut butter. ”