Only that he appears to have acid reflux, or indigestion. Never vomits, but spits up a small amount of foamy saliva. Oh, and his voice is a bit raspy, kinda weaker. We took him in special last year for the same thing and found nothing out of the ordinary. 1/4 of a "Famotidine" 10mg tablet twice a day was recommended and we're not sure if it helped or if the passing of time did the trick.
We're going in to the vet tomorrow morning for yearly checkup and will ask.
Just yesterday it was hot and humid maybe 80 (warm for us) and he was wretching. Cold front passed, wind out of the North, temps dropped to 50-60 and he's all fired up.
Marty