3/4 of mine have collars with RFID tags on them to control how much food they get from the automated feeder. They didn't care for them too much at first, but t

3/4 of mine have collars with RFID tags on them to control how much food they get from the automated feeder. They didn't care for them too much at first, but they quickly learned that it was their meal ticket. The fourth cat doesn't have one because she can't eat kibble without it causing urinary problems.