I had 2 older mini schnauzers that have crossed over the rainbow bridge. In their last years, we bought a doggie door that was electronic and was only supposed to open for them. The loud noises it made when locking scared them and neither would have anything to do with it. The boy did try it a several times and got hung up in it twice. There was no way to release the one we had, so I had to pull his foot out as he was crying. The next day it got took out and a doggie door with a regular swing door and a plastic piece that would lock it at night was installed. Life was good again.