Pooping Green in Dogs

Veterinary reviewed by: Dr. Linda Simon, MVB MRCVS

Why is my dog pooping green?

Veterinary reviewed by: Dr. Linda Simon, MVB MRCVS

Why is my dog pooping green?

What is Pooping Green?

An old adage says, “What goes in, must come out.” As surely as your dog eats, he will need to poop. While pet parents may take joy in walking their dogs (it does serve as a bonding experience), most people don’t actively study their dog’s stool. However, solid waste can tell you as the owner if there is something off with your dog’s gastrointestinal system. Several conditions can cause your dog to have a green-colored stool:

  • Parasite infestation
  • Something he ate such as grass
  • Rat-bait poisoning
  • Intestinal or gallbladder disorders

It should also be said here that puppies will have color variations in their stool as a general rule. If your puppy experiences this and he is up-to-date on vaccinations and deworming, then you likely don’t have anything to worry about if one or two stools are green-brown.

Why Pooping Green Occurs in Dogs

Parasite Infestation

If parasites are present in your dog’s intestinal tract, he may have green-colored poop. It will have a slimy consistency as well. You should look for signs of constipation or straining; be prepared to document this so you can share with your vet. Giardia is a parasite that will cause your dog’s stool to be soft and abnormal. Giardia can be passed between humans and dogs, so extra caution will need to be taken if you suspect giardia.

Something He Ate

While this sounds obvious, if your dog is eating a large amount of grass, his waste could come out looking green. Most of the time eating grass is harmless, but sometimes your dog is eating grass as a sign that something else is wrong. One cause for concern is pica – eating things that aren’t normally food, such as grass. Often this is not a problem; however, some dogs are eating grass because there is something nutritionally that is missing. Switching to a high-fiber dog food can help to alleviate pica. Special care should be taken that your dog does not eat grass that has been treated with herbicides or pesticides. 

Rat-Bait Poisoning

If you believe your pet has ingested rat poisoning, take him to the vet immediately. While a dog that has eaten rat bait may seem fine at first, the rat bait will take a toll on your dog’s health over time. Often, commercial rat poisons work to stop the rat’s blood from clotting, and this will soon take place in your dog’s body as well. Owners report not seeing any problems in their dogs for days after the initial ingestion. Once your dog’s reserve of clotting factor is gone, he will start to bruise easily and possibly bleed internally. If this begins, without clotting factor, your dog may die. If you believe your dog has ingested rat poison, take the box of rat poison so that your vet can tailor just the right treatment for your dog. The antidote might be as simple as Vitamin K. 

Intestinal Disorders

A number of intestinal disorders can cause your pup’s stool to become green: change in diet, inflammatory bowel disease, food allergies, idiopathic hemorrhagic gastroenteritis, small intestine bacterial overgrowth, colitis,  viral infections, cholangitis, hepatitis etc. Each of these should be treated by your vet.

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What to do if your Dog is Pooping Green

If you notice a green stool in combination with eating a lot of grass, try switching your dog to a high-fiber food. One study found that a dog ate grass consistently for a number of years; once her owner switched her diet to one containing more fibre, she no longer desired grass. If you notice your dog straining or suffering from diarrhoea and you know it has been some time since your dog has been dewormed, a trip to the vet for a fecal stool exam is in order. Green stool with no other obvious cause should still be evaluated by your vet to rule out any serious gastrointestinal issues.

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Prevention of Pooping Green

Always be cautious when putting rat bait anywhere on your property. Often curious dogs will eat a block of poison just because the block is there. Intestinal parasites can be prevented by making sure that your dog does not eat other dog’s poop. Dogs that practice pica may be bored; if so, take some time to give your dog a little more exercise.

Green stool can be expensive to treat. If you suspect your dog has green stool or is at risk, start searching for pet insurance today. Brought to you by Pet Insurer, Wag! Wellness lets pet parents compare insurance plans from leading companies like PetPlan and Trupanion. Find the “pawfect” plan for your pet in just a few clicks!

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Cost of Pooping Green

Treating intestinal parasites in your dog can range from less than $100 to $300; the national average to treat intestinal parasites is $300. Rodenticide poisoning is very serious and the expense to eliminate the toxin and restore your pet to health may rise as high as $7500 if they become very unwell and require hospitalisation.

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Worried about the cost of treating your pet's symptoms?

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Pooping Green Questions and Advice from Veterinary Professionals

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Maltipoo

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Two Months

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17 found helpful

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17 found helpful

Has Symptoms

Green Stool

Puppy has pneumonia. Now stool is green and stretchy

Dec. 27, 2020

Owner

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Dr. Linda S. MVB MRCVS

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17 Recommendations

Hi there. This may well be some mucus which can occur due to an infection, stress, parasites etc. Do ensure the pup is eating and has energy. Their gums should be pink and wet. Consider a probiotic anti diarrhoea paste which is often a good idea alongside antibiotics.

Dec. 27, 2020

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Mix

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Ten Years

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1 found helpful

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1 found helpful

Has Symptoms

Painful Urination

He has been wanting out about every 2-3 hours this time I noticed his poop waa very runny and light green but he seems to be straining

Sept. 29, 2020

Owner

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Dr. Michele K. DVM

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1 Recommendations

Thank you for your question. I'm not sure if he is straining to defecate or urinate, but either way, it seems that he should probably see a veterinarian. They will be able to check his urine and make sure that he is not having problems, see why he's having diarrhea and help him with that, and make sure that he is okay.

Sept. 29, 2020

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