Foul-Smelling Diarrhea in Dogs – Top 3 Reasons Why

Disclaimer: The content on is for informational purpose only. It is not intended to be a substitute for professional veterinarian advice, diagnosis, or treatment. Always seek the advice of a veterinarian when in doubt.

Here are a few common causes that can lead to rancid and foul-smelling diarrhea in dogs.

1. Ingredients that cause smelly poop

Certain types of ingredients are known to cause foul-smelling stool and diarrhea. For example, the dog may have foul-smelling diarrhea because he ate too much food that’s rich in sulfur. This may include ingredients like cabbage, cooking oil, and eggs. Did your dog recently eat something that he shouldn’t have touched? Maybe it was some dinner leftovers consisting of oily food or other types of human food that aren’t suitable for dogs? If so, this would be a common explanation for dogs suffering from stomach upsets and foul-smelling diarrhea.

2. Food allergies and intolerance

Foul-smelling diarrhea in dogs could also be a result of food allergies. Just like us, dogs are prone to a variety of allergies, some of which can come from ingredients that are seemingly safe. For example, your dog may have ingested a lot of dairy products like milk and cheese. Smelly diarrhea and other digestive symptoms are common outcomes since dogs are lactose intolerant.

3. Infections like salmonella and giardia

Certain types of viral or bacterial infections, such as salmonella and giardia, may also lead to foul-smelling diarrhea in dogs. Gastrointestinal organs, such as the small and large intestines, become inflamed when a dog gets affected by such infections. In addition to the rancid smell, you may also notice other concerning signs such as seeing blood in the diarrhea. Prompt treatment is necessary if you suspect your dog is suffering from a gastrointestinal infection.


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