Life is good now after I installed our doggy door. There is the occasional foreign object Snoopy brings in from the back yard including rocks. We will find him chewing on one in the living room every now and then. Small price to pay because Snoopy now lets himself out when needing to go to the bathroom. We have a medium size backyard with a 6-foot wooded privacy fence so he is free to come and go as he wishes. We were so intense on potty training him by watching his every move and looking for the stair which meant he wanted to go potty. We pretty much finished his training when I installed the door. One thing I have learned from this is it is not automatic that a dog knows how to use the door. It took only a few days of pushing him through it before he got the procedure down. Now he moves through it faster then I can take a picture. The other thing I learned is the door I purchased from Amazon ($30.00) was meant for a regular door and not a storm door I installed it in. The storm door is a lot thinner and I just used weather stripping on each side to seal it in. I was concerned about other animals getting in but because it is in the outer storm door, the inner door is closed and locked when we leave or go to bed so I never use the sliding door that came with the dog door. Plus Snoopy runs in and out so much that no stray raccoon or cat would ever get close. We have not had a problem yet. We have a pet chicken that I let run around on occasion. I have not tested it with her but that's not a problem a lot of people have. All in all, I can not believe I waited this long before installing one. If you have a fenced in backyard, I highly recommend it. The only con I have found is the unsupervised bringing objects and toys in and out of the back yard. Occasionally we will have to retrieve his stuffed toys from the yard. Small price to pay for us not being his door slaves.