Kota's vet has put her on some medication for allergies. The med is called Depo-Medrol Injection. The problem is that if she keeps taking this med it can cause liver failure. This is a long shot, but does anyone know of any supplements or OTC medicine that will help her? We've already tried Benadryl and it does not help. We are not sure what exactly she is allergic to. She scratches herself raw. She's always had mild allergies, which no grain food fixed. But now that she's older they are getting worse. Her vet says this is somewhat common for collies.