Giardia in dogs and cats: symptoms, transmission and how to eliminate it

Giardiasis is an intestinal infection caused by the protozoan Giardia duodenalis , one of the most common parasites in dogs and cats. Although many animals are asymptomatic carriers, it can cause chronic diarrhea and malabsorption, especially in young or immunocompromised animals.

How is it spread?

Transmission is fecal-oral: the animal ingests giardia cysts present in water or soil contaminated with infected feces. The cysts are very resistant in the environment and can survive for weeks in cold, moist water.

Is it contagious to people?

Some strains of Giardia are zoonotic (transmissible to humans), although the actual risk is low. Standard hygiene measures (washing hands after contact with animal feces) are sufficient to prevent infection.

Symptom

• Chronic or intermittent diarrhea: soft, yellowish stools with a "greasy" or foamy appearance and a very strong odor
• Progressive weight loss despite eating
• Flatulence
• Occasional nausea and vomiting
• Many animals are asymptomatic carriers

Discovery

Diagnosis is made through stool analysis. ELISA tests for stool antigens are more sensitive than direct examination. Sometimes several samples from different days are needed due to the intermittent shedding of cysts.

Treatment

The veterinarian will prescribe the specific antiparasitic treatment. The treatment course usually lasts several days and may need to be repeated. Equally important is disinfecting the environment : giardia cysts are resistant to most common disinfectants but sensitive to heat and diluted bleach.

During treatment, frequent bathing of the animal (especially the perianal area) is essential to remove cysts from the hair and reduce reinfection. Pet- specific hygiene products aid in this process.

Prevention

• Prevent the dog from drinking from puddles or stagnant water
• Always pick up after your pet.
• Wash the drinking troughs regularly
• Disinfect the rest area with diluted bleach (1:32 in water)

Conclusion

Giardiasis is treatable but requires consistency: complete treatment, environmental hygiene, and veterinary follow-up. If your dog has chronic diarrhea with greasy-looking stools, bring a stool sample to your next veterinary appointment.