I totally agree smkie. That's why whenever there is a bone thread I always say I'll never feed my dogs bones, no matter what kind. I was working at a vets office (vet tech) and a dog came in that couldn't poop. The vet tried numerous enemas, certain foods, medicines, nothing worked. When he "reached in" with a finger he came out with a big chunk of splintered chicken bone. After that, the dog was happy to have a good bm by himself, without crying and being in pain.
As for Tira getting the chicken bone, I don't think she swallowed any, but I did give her some bread when we got home.
Better safe than sorry.