Was the chicken bones cooked or had you deboned the bird, then cooked the pieces? The cooking process makes the bones brittle and increases the chances of cutting or piercing the intestine. Just keep a close eye on your pup for signs that there is a blockage or other problems and get him to the vet asap if anything is not right... bloody stool.. not going (obstruction).. not interested in food.

Hope he is OK!!
Shannon