Yes, these things can happen. Toker bit off a teensy chunk of a Nyla bone and I didn't notice. She didn't really throw up, but gagged it up and out it came. I saw a little piece about the size of half a dime mixed in with some liquidy stuff and I felt it and knew. It is a concern that they could swallow a chunk and it could get stuck somewhere along the alimentary canal. But that's true with just about anything. All we can do is supervise the best we can. Usually, if they swallow something very small, it will pass through or they'll throw it up. But not necessarily, I guess, depending on just how small. Glad Jack was okay.