I used to spend a lot of time opening and closing the door for my pets. One of the greatest things we have done is put in pet doors. It took a few days for them to train onto the little passageways, but once they did, they have never looked back. They love their pet doors. Valentine, will occasionally have an upset digestive system and I would find the evidence on the floor in the morning. Now she goes right outside to take care of that. There have been no accidents since we put in those doors. I leave an outside light on every night, so that she can see well and have some protection if she does go out at night. The pet doors have been a great addition the house.