One of my two amazing cats tends towards the chubby side, and so I love Wireless Whiskers' Automatic Feeder! This feeder has doors that open up only for the cat that is wearing the collar tag, keeping Mr. Tubby out of the food when he doesn't need to be eating, but my other cat is free to eat all day long! It's also great if one of your cats is on a special diet or multiple pet homes to keep your dog out of the cat food. -LC