I was reminded by chickerdoodle (who commented on the topic of inside/outside DOGS), the following: "Understandably if the cats have a suitable shelter are are well fed (well fed cats hunt more prey)." I used to keep my horses at a farm where the owners never fixed their cats nor fed them very much, IF any. Once, there was an abandoned STRAY cat who I found in my tackroom/hayroom (that I was renting from the farmer) licking the side of a molasses container because he was so hungry. I started feeding him every day and he got big and strong enough to beat up the farmer's weak and sickly cats. (Eventually he crossed the highway and ended up living with another farmer who bred/raised POA's--MUCH better home for him!) IF YOU HAVE NOT EVER HAD AN OUTSIDE CAT BEFORE, please make sure that you feed him/her!!!!!!!!!!!!!!!!!!!!!! They CANNOT survive on mice, alone, even though a mouse is the best food for a cat. I don't feed the best cat food, but it is ALWAYS available free choice. I live on 5 acres, with several hundred farm acres behind me, and I have NEVER in ten years seen a mouse in my house. My good kitties--I have 4 now, but I've had as many as 6--are in and out of the house and they KEEP it mouse-free. I ONLY see mice in the barn, which understandably has many nooks and crannies to hide in, especially with 400 bales of hay in the loft right now. MY POINT?: DON'T FORGET TO FEED YOUR KITTIES!!!!