Benadryl doesn’t work for all dogs. You may have to try another antihistimine. Check out this page from vetinfo4dogs There’s some great info on this site, that helped me understand allergies better than what my vet told me. It will also tell you about other medications you can try.
I think you DO need another opinion, Robyn. We recently took Chester in for the skin tests, and found several things that the blood tests we had done previously didn’t find. So now Chester has new antigens (allergy shots) that he gets and we’re hoping to see a difference.
I suggest that to give Jasper some relief you do a short round of low dose prednisone, to make him comfortable until you can get him in to see another vet, and maybe save some $ for further testing. It makes a world of difference in how Chester feels physically and his happiness. It’s no fun to be sore and itchy, and have your Mom yelling at you to stop licking and scratching. When I have to yell at him and put the cone on him, I feel bad and he ignores me, so I know it’s not good for our relationship. But, I can’t let him lick and scratch to the point of infection, which he’s done a lot. :(