Hi Diane,
Boxers, boxers, boxers. We have our 2nd boxer and 1 thing I will say about them is that they have very sensitive bellies and skin.
Our first boxer had a VERY sensitive stomach and had hot spots (licking his skin raw). We found that using non toxic cleaners (as their sense of smell is so great (shorter snouted dogs have a more sensitive belly) it affects everything).
We had to switch to an expensive dog food. Royal Canine. There was one made with vegetables (rather than a high meat protein as the first ingredient).
Our 2nd lovely boxer had really bad environmental/seasonal allergies and his hot spots are on his ears.
We give him a few natural things that seem to help him, but I definitely feel your pain. I would be happy to share what we do if you'd like to message me.
Boxers are wonderful, wonderful animals, but almost "prissy" (and I mean that lovingly) with what they need!
Belly Rubs to your boxer baby!
B.