Tibby had HGE last summer. It started with her vomiting (on my bed of course) what appeared to be blood tinged but not frank blood. I started reading about what it could be and she went into the other room with Bubba.
By the time I had her diagnosed and got to the living room there were two or three large puddles of bloody diarrhea - more blood than anything else. Bub was hesitant about taking her to the ER so I played along with him for a few minutes. I went back and re-read then went to the kitchen and told him that if she had one more episode of any kind she was going to the ER. He admitted that she had vomited blood again, so off we went.
I am convinced that the ER saved her with hepastarch, a manmade type of plasma often used in Parvo dogs or other dogs that need a transfusion but a donor is not available. The dr there was wonderful (especially when he found out that I had done ER work) and had her on fluids, the hepastarch, antibiotics. But she turned the corner that night. HGE can go into DIC and the animal will bleed out completely, or it starts to get better and the diarrhea starts to look like raspberry jam.
She spent a couple of days at the regular vet clinic (don't remember how long) but was fine when she came home and hasn't had a problem like that again. She was obviously in pretty bad shape when we first realized she was sick; you are lucky that your was found early on.
RIP Wallis, John Robert, Tibby & Pip
Mom to JoJo, Roxie & Linguini (Cavaliers)
and my birds Moji (Senegal) and Walter (Blue Front Amazon)