I've never run into chicken bones, but I used to walk Bandit on the nice sandy beaches of a local river. We would always run into fish bones. Many of the anglers thought it was cool to throw carp out while fishing, they think they compete with the more desirable species like Walleye and Pike, so if they catch carp they leave them on the beach to rot.

So when walking on the beaches I was always on constant lookout for Bandit eating fish bones. I swear during that time he probably thought his name was "Drop It!".

The other hazard of these rotting fish was, of course, the habit dogs have of rolling in anything smelly. I don't think there is anything that smells worse than wet dog rolled in rotten fish.