Some diseases take hold so quickly that your pooch is in peril nearly as soon as it falls ill. Hemorrhagic gastroenteritis, or HGE, is one of these potential killers.

HGE involves stomach and intestinal upset along with digestive tract bleeding. Bloody diarrhea, often with vomiting, hits fast and hits hard, and dehydration follows close behind.

Any dogs can get HGE, but it usually targets small breeds. The cause is unknown, but HGE sometimes follows a stressful situation or a bout of hyperactivity.

Timely treatment is critical in preventing shock or worse. Crashing canines are hospitalized to receive intravenous fluid therapy, anti-nausea medications and antibiotics. Dogs with HGE also require close monitoring.

Take note: If your dog develops sudden, severe bloody diarrhea, there is no time to waste. Get veterinary help right away.