They are smarter than we give them credit for. We had two that work in tandem to get out of the house. We had visitors to our farm and they had a little girl of about two. The mom was terrified of Rotties so we put both dogs in the house and closed both the screen door and the interior wooden door. We were in the garden when we heard the little girl giggling and saying doggy. To the mom's horror, her little angel was playing with two very large Rotties. There was no problem; the dogs and the little girl were having fun playing. They were very gentle with her, but I think the mom had a heart attack. After they left we had to discover how they got out. TJ had used his powerful jaws to turn the brass knob on the inside door (left his teeth marks) and Sampson had found a way to push the lever handle to release the screen door...