When my oldest chin was a baby (and my only chin), I took him into the bathroom to run around. I sat on the floor with a book while he jumped in and out of the tub and ran all over the place. Then I noticed silence. He had disappeared completely. The door was closed tight, he could not fit under it, but he was nowhere. There were no openings anywhere. I ran and got the Cheerios box and shook it and called his name. He appeared slithering out from underneath the cabinets. Not inside the cabinet where you could see him, but between the cabinet and the wall. Conceivable he could have gotten inside the drywall through the holes where the plumbing comes through. I finally found a small space under the overhang of the cabinets that had not been entirely sealed off. They are so sly about finding things like this -- that was his first and only outtime. I still have him and 5 more. They live happily within the confines of two 3-level FN with tons of toys, houses, wheels, flying saucers, etc. No more out-time, NOTHING is 100% chin-proof, they are far too sneaky for me!