Seeing blood in your dog’s stool is alarming—and for good reason. Bloody diarrhea can be a sign of something mild, like a food reaction, or something much more serious, like poisoning or internal bleeding. So how do you know if it’s an emergency?
In this guide, we’ll explain the causes of bloody diarrhea in dogs, when you should worry, and what steps to take to keep your pet safe and healthy.
Is Bloody Diarrhea in Dogs an Emergency?
Yes, bloody diarrhea in dogs is often an emergency, especially if it comes on suddenly, is severe, or is paired with vomiting, weakness, or signs of pain. It may indicate internal bleeding, infection, or poisoning—situations that require urgent veterinary care.
If your dog has blood in their stool, don’t wait. Contact a 24 hour emergency vet right away to determine the next step.
What Does Bloody Diarrhea in Dogs Look Like?
Bloody diarrhea can show up in different ways, and it’s important to know what you’re seeing:
- Bright red blood usually means fresh bleeding from the lower digestive tract (colon or rectum).
- Dark, tarry stool (called melena) suggests old blood from the upper digestive tract (stomach or small intestine).
Both types can signal serious problems, especially if they appear suddenly or in large amounts. Either way, it’s best to take your dog to a 24 hour animal hospital as soon as possible.
Common Causes of Bloody Diarrhea in Dogs
There are many reasons a dog may have bloody diarrhea. Some are minor, while others are emergencies. Here are the most common causes:
1. Parasites
Worms, giardia, or other intestinal parasites can irritate the digestive tract and lead to bloody stool—especially in puppies or rescue dogs.
2. Infections (Bacterial or Viral)
Illnesses like parvovirus, salmonella, or E. coli can cause bloody diarrhea and are especially dangerous in puppies and unvaccinated dogs.
3. Dietary Indiscretion
Eating spoiled food, garbage, or toxic substances can upset your dog’s stomach and cause internal irritation, bleeding, or worse.
4. Foreign Object or Blockage
If your dog swallowed a toy, bone, or sock, it can tear the intestines or cause a blockage, leading to bloody stool, vomiting, and severe pain.
5. Hemorrhagic Gastroenteritis (HGE)
This is a sudden, severe condition marked by bloody diarrhea and vomiting. It’s very dangerous and can lead to shock or death if not treated quickly.
6. Poisoning
Rat poison, chocolate, grapes, or human medications can all lead to bleeding in the intestines and bloody diarrhea. This is a critical emergency.
7. Tumors or Cancer
Intestinal growths or cancer can also cause bloody stool, especially in older dogs. Regular checkups help detect these early.
When Is Bloody Diarrhea an Emergency?
Some cases of bloody stool may pass on their own, but the following symptoms mean you should visit a vet immediately:
| Signs | Emergency Level |
|---|---|
| Large amounts of bright red blood | High – Get emergency care now |
| Dark, tarry stool (melena) | High – May indicate internal bleeding |
| Bloody diarrhea + vomiting | High – Could be poisoning or infection |
| Weakness, collapse, or shaking | High – Immediate help needed |
| Mild blood, no other symptoms | Low to Moderate – Call your vet for advice |
If your dog is acting unusual in any way, don’t wait. Use 24houremergencyvet.com to find a nearby clinic open now.
What to Do if Your Dog Has Bloody Diarrhea
If you notice bloody diarrhea, take these steps right away:
- Check your dog for other symptoms like vomiting, lethargy, or fever
- Remove food for 8–12 hours to give the stomach a rest (unless your vet says otherwise)
- Offer small amounts of water to avoid dehydration
- Do not give any medications without a vet’s advice
- Call or visit a 24 hour emergency vet clinic right away
Bring a stool sample if possible—it helps the vet make a faster diagnosis.
How Vets Diagnose Bloody Diarrhea
At the vet clinic, your dog will get a full exam. The vet may perform:
- Blood tests to check for infection or anemia
- Stool tests for parasites or bacteria
- X-rays or ultrasound to check for blockages or tumors
- Parvo testing, especially for puppies
Quick diagnosis is key, especially if the cause is something life-threatening like poisoning or hemorrhagic gastroenteritis.
Treatment Options for Bloody Diarrhea
Treatment depends on what’s causing the issue. It may include:
- IV fluids to prevent dehydration
- Antibiotics or antiparasitic medication
- Anti-nausea and anti-diarrhea drugs
- Surgery (in cases of blockage or tumors)
- Hospital stay for severe cases
Your dog may need to be monitored overnight. Early treatment leads to better outcomes, so don’t delay care.
What Does Treatment Cost in the UK?
Here’s a general idea of emergency treatment costs for bloody diarrhea in dogs:
| Service | Estimated Cost (UK) |
|---|---|
| Emergency consultation | £100 – £200 |
| Blood and stool tests | £100 – £250 |
| IV fluids and medications | £150 – £400 |
| X-rays or ultrasound | £200 – £500 |
| Overnight hospitalization | £300 – £800 |
To get fast, affordable care, check 24houremergencyvet.com and find a clinic near you.
How to Prevent Bloody Diarrhea in Dogs
While not all causes can be avoided, here are steps to help keep your dog safe:
- Keep your dog away from trash, spoiled food, and toxic plants
- Stay up to date on vaccines and parasite prevention
- Watch for signs of dietary allergies or food intolerance
- Supervise dogs who chew toys or bones that can break off
- Introduce new foods gradually
Prevention is easier—and cheaper—than emergency vet visits.
Conclusion
Bloody diarrhea in dogs is a serious symptom you should never ignore. Whether it’s caused by infection, parasites, poisoning, or something else, fast treatment gives your pet the best chance of recovery.
If your dog has bloody stool, especially with other symptoms like vomiting or weakness, don’t wait. Go to 24houremergencyvet.com to find a trusted 24 hour emergency vet near you—open day or night to help your dog when it matters most.