Okay, so Miaand a stray cat that we are keeping are BEST friends(most of the time) and Mia loves to play with it. One morning I heard a noise in the other room where Mia was. I went in and she had let the cat inside. I put the cat out and went to drink my coffee and about one hour later I checked on Mia and she AND the cat were inside the crate laying down with the front door wide open. This time when I put the cat out Mia started to whine so I took her outside also. After a bit I went inside with her and read a book. Suddenly I heard a loud noise in with Mia and then the cat meowing. Mia had once more let him inside and they were jumping and playing and using one of Mias dog toys. I have since learned to make sure the door is closed tight.