[Jenna AK]

I'm talking about a possible allergic reaction causing reddened skin, incessant scratching or eye rubbing and what look like hives the size of dimes in leg bends and on the neck area, plus swollen eyelids at the top corners. Also possibly aggravated reverse sneezing.

Could this be a food reaction or something else? It seems body-wide and includes some pretty nasty gut sounds as well. No diarrhea so far but a bit of extra urination.

We have chlorpheniramine to help combat the itching and reduce the swelling but I've never seen a reaction like this before in a dog.

I've looked up possible recalls on this brand and can't find any. Some folks have cats who are having fur pulling episodes from eating it but nothing else that I can see.
I really need help isolating the problem. Thanks in advance for any replies.