Can your pet open doors?

Carling can, we had to change the door handles to the round ones because he kept letting himself into our bedroom and sleeping on the bed. I didn't mind him doing it but Guinness decided to play football on it one night and also decided she was going to dig up the mattress. We came up the stairs after a long hard shift working in the pub to be greeted by half the bed sheet down the stairs. Thankfully she hadn't damaged the duvet or pillows but the mattress was ruined! We told her off and she just walked back in the room, picked up the football gave us the look and walked off!