Might check out that book BD.
It's definitely a tough call to make - The OR (Operating room) would be out of the question to my mind for obvious sterility issues.
But if he had this dog because of an issue or disability as he does...I think they should allow dogs in. If they allow guide-dogs in the ER then they definitely should allow PTSD dogs.
BUT. What constitutes a PTSD dog, this is not well outlined in the article. I'm be really curious on that one actually. I mean I have fairly good faith that certified guide dogs don't get out of line too often. - but I don't know what agency governs PTSD dogs.
That said, imo
if these dogs are known to be safe and this Veteran was given one to treat an illness - then he should be given some respect for goodness sake. And he should probably sue the hospital
or make a big deal about this. For his sake and for other people. As far as I know PTSD is a recognized and debilitating disorder and the hospital should show some compassion. And this Veteran has rights, and likely a lot of dog loving people who support him.