I recently heard about someone who went thru this scary ordeal with one of her dogs so I thought I would post some articles to hopefully help others.
Bloody diarrhea and bloody vomit are the signs and the dog needs immediate veterinary care.
They really don’t know the cause and it is said to not be contagious but there are cases of more than one dog in a household to get GHE
Here is an article written by someone that has one of our pups.
Another from Merck Vet Manual
More info here