[Paul Redden Countryfresh]

Quite chuffed I bought my regular custy's white synthetic lounge carpet up like new, I then get a call "did those builders let the dogs in the lounge?" No I said they had gone and I closed the door to keep them out" Turns out they dug a hole in the carpet     Felt really bad about that, but he was nice enough to pay me. Apparantly the dogs can open the door.
Does anyone know why they do this? 
Mouse under the floorboards?