I do give my shelter care kitties treats. I clean on Fridays and they get wet food as a treat afterward. Soon as I head to the cabinet, the ones who have been there at least one Friday know what's up and they start to scream!
My little tuxi boy Checkers is addicted to those treats that are small, pillow shaped - crunchy on the outside, soft on the inside - the brand name escapes me! He cries and cries and cries til he gets some from me with that sweet little meow that gets increasingly insistent! He knows which cabinet they are in and he is right there!! and runs ahead of me and jumps on the storage bench READY!!!! You would think he hasn't eaten in days the way he behaves.