Bloodwork came back. It's not that malignant Histiocytosis thing that the vet's suspected he had, rather it's Hemolytic Anemia. It's an autoimmune disease where his body is attacking his red blood cells, viewing them as foreign. The outcome isn't much different from the Histio though. He just has a small chance of pulling through (would be a better chance if not for his age) and not needing medication for the rest of his life (however long it may be), whereas if he'd had the other, there was no chance. So he has to stay on prednisone now to hopefully control the disease and to give him a better chance at living a quality life.