A veterinarian giving pills to a golden retriever puppy.

Unfortunately, some dogs struggle with serious health conditions that can negatively impact their digestive tract. In dogs, Flagyl can treat various health conditions, particularly those related to gastrointestinal issues. If your dog has a history of gastrointestinal and/or digestive problems, talk to their veterinarian about potential treatment options, including a prescription of Flagyl.

What is Flagyl?

Flagyl (metronidazole) is an antibiotic primarily used to treat human infections, but it can also treat the following in dogs:

  • Inflammatory bowel disease
  • Diarrhea
  • Intestinal parasites

Is Flagyl safe for dogs?

The safety of Flagyl in dogs depends on many factors, including the dog’s age, weight, medical history and any medication(s) they take. Flagyl is not currently FDA-approved for veterinary use, but many veterinarians still prescribe it to dogs they believe could benefit from it. For more personalized information regarding Flagyl’s safety in dogs, talk to your veterinarian.


While dosing will differ for all dogs, 1-800-PetMeds states the following as a general dosing guideline for dogs:

  • About 5-20mg per 1kg of body weight in your dog

Please note: dosing will differ in other animals, such as cats. It is essential that you consult your veterinarian for specific dosing instructions for your dog.

Side Effects

Your dog might experience side effects during treatment with Flagyl, including but not limited to:

  • Diarrhea
  • Bloody or watery stool
  • Hives
  • Breathing difficulties
  • Seizures
  • Illness
  • Nausea
  • Vomiting
  • Dizziness
  • Sneezing
  • Swollen tongue

Please note this list is not exhaustive. If you notice your dog experiencing any side effects with Flagyl, call their veterinarian immediately. Some side effects may indicate serious health problems.

Final Thoughts

While Flagyl can positively impact some dogs’ health, it is not the right medication for every dog. Your dog’s health is important, and talking to their veterinarian can help when it comes to the best medication and/or treatment plan for your pet.

Disclaimer: This article does not constitute professional medical advice, nor can it replace the advice of a licensed professional.

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