I use all natural pine litter for the cats and completely change out the boxes every 3-4 days. I think that's WAY too much to put in a composte pile.
I'm conflicted on the meats though. I'll have to read more. Some say yes, some say no.... We don't consume a ton of meat anyway so it would be pretty small portions.
What about things like crab shells if we have crabs?
You have not smelled a stink worse than decomposing crab shells. Did that once and our compost pile is out behind the goat pen. NEVER AGAIN!!!!