Well, the little munchkin has figured out how to get in the doggie door even when it is locked!!!

He just keeps head butting it, until the bottom lock "pops", and he squishes himself inside
Of course, now the other two think that is a GREAT idea, so yesterday, they "squished" through as well ............. and we came home to all 3 dogs trapped inside ....... dying to get outside to pee!!!
They had probably been "stuck" inside for about 3 hours - and Murphy was a good boy, he did all his business on the newspaper at the back door.

HOWEVER, today I have BLOCKED the door, and he cannot get close enough to head butt it (I think).