Hockey, Anyone?

So, on top of the cat pee smell (which, I must confess, has taken up the majority of my time and energy today), my baby boy's room smells like poo. I looked around this morning, stripped his bed, picked up toys, didn't see anything. This afternoon it still smells strongly of poo, so I decide to wipe the floor with Clorox wipes. As I'm wiping under the changing table, a hockey puck, made of tiny turds, slides out. Wiping into the hall, I notice other little turdlets, under the air filter, because, apparently, my lovely boy was sliding them under his door this morning.