Doggy teamwork gets the glass door open

"We'd close the door of the room, so the dogs wouldn't come in and make a mess and they always came in there, until one day I was hiding filming to find out what was going on. That's when the four came together and opened the door, the first opens with the little teeth, the second helps with their teeth and paws, and the other two take the opportunity to follow them." Priceless!