We have the autofeeder and litter box in the garage. There's a cat flap in the wall between there and the rest of the house. This damn cat will yell to have us open the door for him. We finally figured out why, it's because the other one will occasionally pounce on him when he sticks his nose through, and that's the last thing you want when you're clenching your sphincters. So we open the door for him.