I hope they find out what's wrong with him. Please keep us updated.

From the sound of the gagging, it reminds me of when dogs come in at work with a respiratory infection. Sometimes the sinus drainage can cause gagging and diarrhea. If it was that a simple round of antibiotics should clear it up.

As for possibly eating a pin. I can't say for sure but seems to me most of the dogs at work that eat strange things and have blockages or preforated insides are really sick, don't eat well, and just lay around alot. We recently lost one after the owner fed a steak bone and it not only caused a blockage, but preforated something (intestine I think) along the way. That dog was very ill and lethargic.

I hope your dog has something easily treated. Glad to hear Muddy acts normal otherwise.

Keep us posted.