Well, it didn't work. The vet is now closed and Huey didn't produce. Earlier this evening, he started stressing because he had to go and he wouldn't use the box with the pellets in there. When I spoke softly with him and encouraged him to step inside, he literally jumped at my arm and bit me. Watching him stress so much wasn't worth it, so I put back the litter and he pooped. Still no pee.