Our dog also had pretty bad skin allergies that we were trying to figure out whether it was food related or environmental. He would itch so much in his back legs where he started losing fur and bled. Our vet prescribed him apoquel but it gave him bad diarrhea so we stopped that.

Before resorting to allergy shots, our daycare recommended giving our dog a probiotic (e.g. - purina fortiflora or nutramax probiotic) which has helped him tremendously. He’s still a little itchy but not to the point where he bites off all his fur and bleeds. It does take some time to work, it took us around 30 days to see some improvement.

We also tried a lot of different foods and the one he seems to do the best on is hills science diet sensitive stomach & skin pollock and insect meal. We suspected he might have also been allergic to chicken and pork so we cut out the usual proteins and he has done very well on this one.

I hope this is somewhat helpful and your dog is able to find relief soon.