My 10-year-old Tibetan Spaniel developed Cushings. I looked into holistic treatments and found Cushex drops containing: Taraxacum officinale, Arctium lappa, Astragalus membranaceous, Arsenicum (30C), Hepar. sulph. (30C), Mercurius (30C), and sulphur (30C). I use 3-4 drops on his food, which also includes raw frozen chicken or beef, home-made plain yogurt and canned pumpkin. Within two weeks his appetite was level, he greatly reduced his constant gulping of water, his coat grew back and his energy level and mood are fantastic.
Now that he's been on the drops for a while, I cut back to every-other-day for the drops for maintenance.