hey there!! the red between digits is allergy..not sure about the other...Chicken, lamb and beef are no no's ...someone who feeds raw may also be able to help.I do not feed raw, although hear great things about it and they have much success. I give Harley4 Benadryl a day...and feed him Natural Balance grain free and bison as the protein. As for vinegar i use All Natural Apple Cider Vinegar (ACV)
I rub it in his ears and apply to nose folds and digits. theres a good article here somewhere about ACV...get at health food shop. I also put greek yogurt on his food daily, he looooves it, but wont drink ACV in water, they say a Tbl. in water..good luck and hope this helps. let us know what your vet says. Is he a bulldog vet, if not theres a list of vet s on this site.