Positive reinforcement is powerful. When pets perform a desired behavior — sitting, coming when called, being nice to the cats — they are rewarded. Pets learns to connect the treat with the actions we wants, and becomes more likely to offer them…even when we don’t reward her. What’s true for dogs is true for people too. Does nagging your spouse actually work? Probably not. (In fact, it probably has the opposite effect you intend!) But if you reward the behavior your want, you’ll eventually see it offered without prompting. The same thing is true with children, co-workers, family members, and so on.