As for Mr. Pibb, our normal vet differed slightly with the opinion of the SPCA vet (who only took about a minute with him, listened to his heart and lungs, then did nothing else). He said that the coughing/gagging, since it IS productive, along with the lethargy and loss of appetite, probably ARE due to the heartworms instead of bordatella. Our vet also said that the next 60 days will be hard on everyone involved, but if we get Mr. Pibb through the next 60 or so days he should be fine and return to the wonderful dog we're sure he will be.
I feel MUCH better now!!!! I'm off to fight the second part of the attack at work ;)