It might have something to do with - you know, I am just thinking that if I am the cat, when I'm pooping, you know, I've got to strain a little bit more and maybe that affects how the kitty litter feels on my paws. I'd try a different sub straight, or something like that - make sure it's not slippery.
When I'm stuck for a closing to a lyric, I will drag out my last resort: overwhelming illogic.