Correct!
The characteristic (diagnostic) clinical sign seen in canine HGE is bloody diarrhea.
HGE (at least in terms of veterinary medicine) stands for Hemorrhagic GastroEnteritis. The most notable sign seen with HGE is a very sudden onset of bloody diarrhea in a previously healthy dog. Vomiting, not eating (anorexia), and listlessness are also seen.
HGE is diagnosed primarily by ruling out other causes of bloody diarrhea. The sudden appearance of bloody diarrhea and a high packed cell volume (PCV) in a previously healthy dog rule in favor of the HGE diagnosis.
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