First, I'd separate the flu and rhino, to make sure it's the rhino,
though I suspect you're probably right. Secondly, try another
manufacturer--I don't want to name any names, but I have had a lot more
nasty reactions with one particular product (which I no longer use).Third,
try swabbing the injection site with DMSO afterwards, and give a gram of
bute with dinner that evening.
--C.M.Newell, DVM
"The expression in a horse's eye is like a blessing on a good man's house."
--Sayied iben-el Rabil, quoting the Prophet