It may be a good idea to invest in a small shop vac. Chins poop a lot naturally, and there's no way to avoid it. Because their poop is relatively dry, it's very easy to vacuum up after playtime, and you'd never know a chin had been there.
Very cute chins! They're all adorable!
--On a side note, be very careful having your chins near a cat. Cats and chins should not have contact, even if it's supervised.
Very nice pics! Thanks for sharing!