Hello, my name isXXXXX am a licensed veterinarian and I will try and help you as best as I can.
Bones are one of the most common causes of gastrointestinal obstruction in dogs for the exact reason you described. This is why all vets recommend against giving them to dogs. In the case of Dobber, with it already being 3 days later, it is likely the bone has been dissolved in the stomach and will not cause any problems. If you see any vomiting or diarrhea, that is a sign the bone is still in the GI tract and will need surgical removal.
I doubt you will see anything abnormal this late, however if you do I would consult your veterinarian. Please feel free to reply back if you need any further information.
P.S. So that large bone - five to six inches long just sat there in his stomach for the last three days and now it is just 'gone'!; i.e. dissolved by his stomach acids?
So far so good!
Thank you for your excellent response . It helped to relieve our concerns. My sister reported she stirred the dog's feces each day after it occurred to see if there was any blood in his stool, but none so far. Looks like it is goung to be fine.
Thanks for your help.