Giardia is a tiny parasite that infects the intestines of cats. It causes diarrhea, vomiting, and weight loss. The parasite lives in contaminated water, soil, or feces. Cats get infected by swallowing Giardia cysts, which then grow in their gut.
This infection is common in cats, especially kittens and cats with weak immune systems. Giardia is zoonotic, meaning humans can catch it from infected cats. Proper treatment and hygiene are important.
Symptoms of Giardia in Cats
Not all infected cats show symptoms. But when they do, signs include:
- Watery diarrhea (often foul-smelling)
- Mucus in stool
- Vomiting
- Weight loss
- Dehydration
- Lethargy
If your cat has these symptoms, see a vet. Diarrhea from Giardia can lead to serious dehydration.
How Do Cats Get Giardia?
Cats get Giardia by:
- Drinking dirty water (ponds, puddles, or unclean bowls)
- Eating contaminated food
- Grooming after stepping in infected feces
- Living in crowded or unsanitary places (shelters, catteries)
Outdoor cats are at higher risk. But indoor cats can get it too if their environment is unclean.
Diagnosing Giardia in Cats
A vet will diagnose Giardia using:
1. Fecal Test
The vet checks a stool sample under a microscope for Giardia cysts. Sometimes, multiple tests are needed because the parasite is not always shed in every stool.
2. ELISA Test
This detects Giardia proteins in the stool. It’s more accurate than a basic fecal exam.
3. PCR Test
A DNA test that confirms Giardia. It’s very precise but more expensive.
If your cat tests positive, treatment starts immediately.
How to Treat Giardia in Cats
Treatment involves medication, cleaning, and diet changes.
1. Medications
Fenbendazole (Panacur):
- A dewormer that kills Giardia.
- Given daily for 3-5 days.
- Safe for kittens and pregnant cats.
Metronidazole (Flagyl):
- An antibiotic that fights bacteria and parasites.
- Used for 5-7 days.
- May cause side effects like nausea or loss of appetite.
Sometimes, both drugs are combined for better results.
2. Probiotics
Giardia disrupts gut bacteria. Probiotics help restore balance. Common options:
- FortiFlora®
- Purina Pro Plan Veterinary Supplements
3. Hydration Therapy
Cats with diarrhea lose fluids. If your cat is dehydrated, the vet may give:
- Subcutaneous fluids (under the skin)
- IV fluids (in severe cases)
4. Diet Changes
A bland diet helps soothe the gut. Try:
- Boiled chicken & rice
- Prescription gastrointestinal food (Hill’s I/D, Royal Canin Digestive Care)
Avoid dairy, fatty foods, and treats until recovery.
Cleaning to Prevent Reinfection
Giardia cysts survive in the environment. To prevent reinfection:
- Wash bedding in hot water and bleach (if safe for fabric).
- Disinfect litter boxes daily with a pet-safe cleaner (like Rescue™ or diluted bleach).
- Steam clean carpets and upholstery (heat kills cysts).
- Bathe your cat (to remove cysts from fur).
Repeat cleaning for several weeks after treatment.
Preventing Giardia in Cats
Prevention is better than cure. Follow these steps:
- Provide clean water (change daily, avoid outdoor puddles).
- Keep litter boxes clean (scoop daily, disinfect weekly).
- Wash food bowls regularly.
- Limit exposure to stray cats (they may carry Giardia).
- Regular vet check-ups (especially for kittens).
Can Humans Get Giardia from Cats?
Yes, but it’s rare. To stay safe:
- Wash hands after handling cat litter.
- Wear gloves when cleaning diarrhea.
- Disinfect surfaces regularly.
Children and people with weak immune systems should be extra careful.
When to See a Vet
Call the vet if your cat:
- Has diarrhea for more than 2 days
- Seems weak or dehydrated
- Stops eating
- Has bloody stool
Severe cases need quick treatment.
Natural Remedies for Giardia (Do They Work?)
Some owners try natural treatments, but most are not proven.
- Pumpkin puree (plain, no sugar) – May help firm stool.
- Slippery elm – Soothes digestion (ask vet first).
Always check with a vet before trying home remedies.
Recovery Time for Giardia
Most cats recover in 1-2 weeks with treatment. Some need longer if the infection is severe.
After treatment, the vet may retest stool to ensure Giardia is gone.
Final Thoughts
Giardia is treatable with proper care. Medications, cleanliness, and good hydration help cats recover fast. Preventing reinfection is key—clean thoroughly and keep your cat’s environment safe. If you suspect Giardia, see a vet early. Quick action prevents complications. By following these steps, your cat can stay healthy and Giardia-free!
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