I'm a nurse so I have to bust in on this one. Tagamet is for the prednisone and I think also the Rimadyl. Prednisone is hard on the lining of the intestinal tract so you give a patient Tagamet to help protect them from getting an ulcer. I looked up Rimadyl, it is a non-steroidal anti-inflammatory (like a human patient would use ibuprofen or naproxen) and those too can be hard on the lining of the GI tract so you also use Tagamet for that. Also just the stress of being ill can put a human patient at risk of ulcers - maybe a canine patient too. I didn't know until I read your post that a veterinarian can do that for a dog patient just as a doctor would for a human patient! I am so glad her blood count (I'm assuming it's her hematocrit) is increasing. Lady, please take all your medicine like a trouper and let your guardian give you a skritch for me. Over and out.