TL;DR: Explosive watery diarrhea in dogs can lead to rapid dehydration and requires immediate veterinary attention if accompanied by vomiting, lethargy, or blood. Providing a photo of the stool helps your vet quickly determine the cause and urgency of the situation.
What causes my dog to have sudden explosive watery diarrhea?
Explosive watery diarrhea occurs when the intestines move contents too quickly to absorb water. Common causes include:
- Dietary indiscretion (eating something they shouldn't have)
- Sudden changes in food
- Intestinal parasites
- Bacterial infections
- Viral illnesses like parvovirus
Is my dog's explosive diarrhea a veterinary emergency?
The urgency level is generally classified as Medium, but the risk of dehydration is high. You should contact an emergency veterinarian immediately if your dog displays:
- Lethargy
- Vomiting
- A tense abdomen
- Blood in the diarrhea
How does taking a photo of my dog's stool help with veterinary triage?
Taking a clear photo of the stool helps the veterinary team triage your dog more effectively by providing visual information such as:
- The color and consistency of the stool
- The presence of mucus or blood
- The likely location of inflammation in the GI tract
- The correct priority of care over the phone or upon arrival
Clinical Context (Merck Veterinary Manual)
In dogs presenting with explosive watery diarrhea, initial triage should assess for hypovolemic and endotoxic shock, indicated by poor capillary refill time, purplish mucous membranes, and cold extremities. Diagnostic considerations include hemoconcentration (PCV >55%) and a normal to slightly decreased total plasma protein concentration, with further evaluation involving selective fecal cultures for pathogens such as Clostridium spp, Salmonella spp, and Campylobacter spp, as well as evaluation for Clostridium spp enterotoxin via fecal ELISA. Differentials to consider include bacterial, viral (e.g., parvovirus, coronavirus), and parasitic gastroenteritis, systemic disturbances with secondary GI involvement (e.g., hypoadrenocorticism, pancreatitis, renal failure, hepatic disease), coagulopathy, severe GI ulceration, neoplasia, and GI perforation of any etiology. Immediate next steps involve aggressive intravenous isotonic fluid therapy.
Chapter: Gastroenterology, Emergency, Critical Care
Source: The Merck Veterinary Manual, 11th Edition (Page 287)