Laymen's Terms
Hemorragphic Gastroenteritis (HGE) sounds like a BIG word for "Blood in the Stool". Blood can be in the stool for many reasons. Believe it or not it is a sign of FOOD POISONING in a dog or cat. Completely harmless and will pass. Maybe allow the dog to eat some fresh non-chemically treated grasses. It settles their stomachs and may help with digestion.
If the dog's condition was Parvo, then it most likely would have died already. It doesn't take but a few days or Parvo to be deadly. It is EXTREMELY contagious and ALL bedding would need bleached or destroyed before any more animals could be near it. The symptom's you have describe doesn't lead me to believe Parvo is a factor here. That should be good news.
If they do need to give fluids they will do it intraveniously just like humans. They may keep the dog overnight in case of reaction and observation. It also may be given on a "Slow Drip" which takes longer.
My suggestion is to watch your dog's diet. Make observations on what ingrediants may be in the dog food if you a series of changes on type of food. Typical in the first months of pet ownership until a brand and type is developed. Make sure the dog isn't eating some kind of plants low enough for it to reach. Grass is good but other plants like Aloe are not.
Your vet should know what is wrong by the next visit I hope. Good luck!
Scooby, Shaggy the "Dogs", Ms. Thang the "Cat" and introducing Measley Weasle "The Ferret".
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