Well, I've got four litter boxes now that Mikesch is using regularly. He still comes running whenever he hears Binky scratching in the litter, which causes poor Binky to leave the box as soon as possible without finishing his business. In the worst case this results in a trail of poop running from the box to Binky's favorite hiding place. It's not that Mikesch is aggressive, he just wants to get into Binky's box to scratch and pee, too. I've tried distracting Mikesch, but short of picking him up (which he struggles against when he's on a mission) or closing the doors to the room whenever I see Binky heading for the litter box I haven't found a way to keep him away. Is there anything I could do to make Binky feel more secure? It is a hooded box, but maybe he feels trapped and an open one might be better? Would having two boxes next to each other or one that's big enough to hold them both help maybe? Or would it just cause even more distress to Binky if there's another cat scratching "next door" from him?

Well, it's been 10 days now since Mikesch's surgery and he's still into ambushing Binky at the litter box, though it seems he's stopped spraying. They seem to have settled on a favorite litter box in the basement and only occasionally will use the others. As a matter of fact, when I was gone overnight they exclusively used that one box for pooping to the point that it was a real mess when I came back. The one right next to it was untouched except for one lonely pee clump. Is that normal? I'd have expected them to move on to a clean box once their favorite one got too messy. Instead, they decided to really mess one up whereas I didn't even have to clean half of the other boxes at all. I guess I can probably start reducing the number of litter boxes in the house now...