Oh your poor husband - my OH picked it up a few years ago on a business trip, it was truly awful, he was very very poorly and I wouldn't wish it on anyone.
My information is that the leading cause is mass produced chicken although obviously it can come from other sources. I wouldn't like to speculate in your hubby's case but do wonder if, when its very hard to trace the cause, that a young puppy is going to be an easy scapegoat (no pun intended!
) and a doctor, or whoever it was, might just decide "well they have a puppy, we need look no further"
If the goat's milk is from a reliable supplier, I wouldn't imagine it to be a problem....
Just out of interest though, - is there any particular reason for giving it to your pup?
I wish your hubby a good recovery!