Maddie Matterhorn Mattern, popularly known on Instagram as thebadpup, was regularly escaping from her doggy gate at her Philadelphia home. Her owners couldn’t work out how, so they set up a camera at the gate to find out just how she was managing the feat. They discovered that after standing on two legs and not giving up, Maddie was able to open the gate in seconds! Credit: Instagram/thebadpup