I can't really answer your questions either. My RB Sunny would also paw at my sliding glass door. He's do this if he saw dry leaves blowing around in the wind. I guess he thought that if he pawed at the door enough that he'd be able to get through to the leaves.

He was also the one that would pee very high in the litter boxes but only in the ones that had covers on them. The pee would then leak through so I had to put puppy pee pads under the litter boxes and I'd also have to clean the lid and box with an enzyme cleaner. I still use the puppy pee pads under and in back of the litter boxes just in case.