Pet Health

Giardiasis in Cats

Discover the signs, symptoms, and treatment of giardiasis in cats. Learn how to keep your feline friend healthy and prevent this common parasitic infection.
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
Close-up of a healthy cat examining its surroundings, symbolizing the importance of hygiene to prevent giardiasis.

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Has your cat been having diarrhea, losing weight, or just not acting like their usual self? As a pet parent, it's natural to feel worried when something seems off. Giardiasis, a common intestinal infection caused by a microscopic parasite called Giardia, could be the culprit. The good news? It's treatable, and with the right care, your feline friend can get back to their happy, healthy self.

⚠️ What to Watch For

Giardiasis often affects a cat's gastrointestinal system, leading to uncomfortable and sometimes messy symptoms. However, the signs can vary between cats. Here’s what you should keep an eye on:

  • Frequent diarrhea (sometimes with a greasy or foul-smelling appearance)
  • Weight loss despite a normal appetite
  • Lethargy or decreased energy levels
  • Occasional vomiting
  • Dehydration from prolonged diarrhea

Some cats may carry Giardia without showing obvious symptoms, but they can still pass the parasite to other pets or contaminate their environment.

🔍 Possible Causes

Giardia is a protozoan parasite that thrives in wet, unsanitary environments. Cats can become infected by ingesting Giardia cysts found in contaminated water, food, or surfaces. Here are some common sources of infection:

  • Drinking from puddles, streams, or other untreated water sources
  • Sharing litter boxes or food bowls with infected cats
  • Grooming fur that has been exposed to contaminated feces

Kittens, senior cats, and those with weakened immune systems are more susceptible to infection due to their limited ability to fight off parasites.

✅ What You Can Do at Home

If you suspect your cat has Giardia, there are steps you can take at home to support their recovery and prevent the spread of infection:

  • Keep your cat’s environment clean. Scoop litter boxes daily and disinfect with a pet-safe cleaner.
  • Wash food and water bowls frequently with hot, soapy water.
  • Provide fresh, clean drinking water at all times. Avoid letting your cat drink from outdoor water sources.
  • Bathe your cat (if they tolerate it) to remove any Giardia cysts that may be clinging to their fur, especially around the rear end.

While these steps can help manage symptoms and reduce the risk of reinfection, they won’t eliminate the parasite entirely. Veterinary treatment is necessary to fully resolve the condition.

💡 When to Call a Vet

Giardiasis requires professional diagnosis and treatment to ensure your cat recovers fully. Call your vet if:

  • Your cat has persistent diarrhea lasting more than 48 hours
  • They are losing weight or becoming dehydrated
  • Other pets in your home are showing similar symptoms

Your veterinarian will likely recommend diagnostic tests, such as a fecal analysis or a Giardia antigen test, to confirm the presence of the parasite. Treatment typically involves anti-parasitic medications like fenbendazole or metronidazole, which are safe and effective when used as directed.

In severe cases or if your cat becomes dehydrated, supportive care like fluid therapy may be necessary. Always follow your vet’s instructions for administering medications and completing the full course of treatment.

FAQs

Q: Can humans catch Giardia from cats?
A: Yes, Giardia can be transmitted to humans (a condition called zoonosis), though it’s rare. To reduce the risk, practice good hygiene by washing your hands thoroughly after handling your cat, cleaning their litter box, or disinfecting their environment.

Q: How long does it take for a cat to recover from Giardia?
A: With proper treatment, most cats recover within one to two weeks. However, it’s important to complete the full course of medication and follow your vet’s advice to prevent reinfection.

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References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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