Well, I know you had him checked and he doesn't have a UTI. Maybe he just gets excited to see you! Maybe this box will do the trick. I hope so. He's hit and miss, so he certainly knows how to use the box. If he's doing a big pee though, it makes me wonder if he has any issues with his little bladder. It will probably turn out to be something really simple.He did it this morning so I added this box this afternoon - I was thinking the same that the litter box he likes the most is maybe too far away sometimes? And he does seem to drink a lot of water. There’s other litter box options close by but the one I just added here is very similar (same litter and style) as the box he’s been using the most lately. So fingers crossed once again.