I have seen other posts about their Vs breaking out in hives, but after combing through and viewing any photos included, I didn't see any quite like mine's outbreak this past weekend. As you can see in the photo, it was a really bad case. I have other pictures from various stages, but most are blurry because he is in a constant state of motion. Luckily, it was fairly contained/localized to his knees, with just a few random other spots.
He is much, much better now. Benadryl provided immediate relief, and we did not need an emergency vet visit. Yesterday, we saw the vet and were prescribed Prednisone for a week since the hives were still coming back, though much weaker, after the Benadryl would start to wear off.
We don't know what caused the hives. We think he made contact with something in the woods while on our evening walk Saturday, since he broke out shortly after. Maybe it was a bug bite, or maybe it was a plant of some sort. We frequent those woods daily and have never had this problem, and we've even been back since Saturday with no additional outbreaks (though it has been raining daily). It was in the upper 60s that day, and the bugs were definitely waking up from their winter slumber, so I'm really hoping this was an isolated event and not seasonal.
Just thought I would share the story and the photo since spring is upon us (at least in the South).