Oh, Jenn, I'm so sorry. I don't have any idea, but I checked the Shooterdog site and it has this:
What shall I do for my Yorkie's bloody diarrhea and what is HGE?
HEMORRHAGIC GASTRIC ENTERITIS
Hemorrhagic Gastric Enteritis is a serious threat to all dogs, but particularly dangerous to the smaller breeds.
Is it Parvo, Corona, Giardia, or Cambylobacter Enteritis? Any kind of bacterial diarrhea can quickly dehydrate an animal and the tinies are in great peril as they have little weight to lose before they are dehydrated and need IV rehydration.
Your dog can be infected by a walk in the park, or at a dog show, or other congregation of dogs. Anywhere from 2-10 days from exposure, your dog can come down with this problem, starting with vomiting, lethargy, refusing to eat, and progressing to mucous covered stool, loose stools, profuse diarrhea and bloody diarrhea.
Though it is important that your dog is placed on wide spectrum antibiotics, it is important that a culture be done first so that you know exactly what bacteria you are treating. Many cases of Hemorrhagic Gastric Enteritis are treated with a combination of Amoxicillin and Flagyl, but both these drugs will probably be recommended by your veterinarian at the first sign of bloody diarrhea and vomiting. DO NOT waste time, particularly with the smaller breeds, as they have little reserves to lose fluid thru diarrhea, especially bloody diarrhea. My vet has instructed me to go ahead and give the Amoxicillin 50 mg two times a day (toy dogs) and if there is no change in 12 hours to bring the dog in for further evaluation. I have seen severe bloody diarrhea, bright red blood, stopped after administering Amoxicillin as my vet instructed, along with kaopectolin or other anti diarrhea agent from your vet. In a more severe case, he also had me give Flagyl at the same time. Consult your veterinarian for proper dosage by weight of your dog.
http://www.shooterdog.com/alexfaq3.htm#HGE