My Mastiff mix "Lagetha" has had allergies for a good while. The vet prescribed prednisone for bumps on her head and down her back. This helped but when she goes off the meds the bumps came back. I've tried going on a grain free and poultry free diet which had little effect. I then put her on an allergy supplement that cured the bumps but now she scratches constantly. I hope people have may have dealt with this problem could suggest anything or have any advise. I would well appreciate it.