Hello, I am Dr. Peter a licensed Veterinarian. I would like to help. I need to ask you a few questions to be well informed and give you the best advise. There is no additional charge for information request.
1- How long has it been since he ingested the bone?
2- Can you describe his symptoms?
The symptoms that you are describing are consistent with a possible obstruction or perforation of the intestinal tract. Unfortunately, there is really nothing you can give him to dissolve the bone. If there is an obstruction or perforation of the intestinal tract that is actually an emergency and needs to be seen by a veterinarian immediately, a quick xray will determine the exact problem. I know, this is not the answer you expected to hear, but, truly it is the only option. Have him checked by a veterinarian today.
If you have additional questions I will be glad to answer them.