My dogs absolutely LOVE ripping cardboard. It's amusing how excited they get when I give them a piece. I have an odd cat that likes ripping cardboard and shredding paper too. There's not much left after the dogs get done with a box though.

You can't leave any important papers around. Once I caught my cat on my kitchen table with a check in his mouth. Luckily I got it before it was destroyed. He likes to shred a wad of napkins too. Then he tosses them off the kitchen table onto the floor. The dogs grab them and take over from there. I can't leave a bowl of grapes out either. The same cat rips the grapes off the vine and bats them on the floor. Then he bats them all around the floor.
I think you would have to see the dog hair to believe it. Every day I have gobs of hair lined up on both sides of my hallway. Every day the floor of the room with the dog crates is covered in hair. I mean covered. It's ridiculous.