Good suggestions, everyone, thanks!

I think I might give the trial sponge bath a shot. I'd be more inclined to take the catnip route if Rizz treated the seal more like his other toys. I really can't figure out what it is to him. It's either prey, and he's bringing us his "kill," or he's in love with it. In any case, he's got some kind of weird relationship with it. I'm thinking of putting him on a daytime talk show. You know, "Next time on Donahue: Cats who bond with stuffed artic critters, and the meowmies who love them."