I agree with you Ben. My worry is more that they will get out, and we live near a busy road (they try hard to everytime the door is open!) Whenever we leave, I check carefully where they are in the house. My husband used to think I was nuts, but now he does it too since he has turned into such a cat-lover! I found one thing that works well with one of my cats is to feed him a bit just before we walk out the door. It distracts him because he is a bit of a piggy. The other cat won't fall for it though.