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208 Breeds, 422 Health Conditions  |  Find a Vet

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Giardiasis

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Condition Overview

This disease is caused by a protozoan of the giardia species.

Symptoms

Most infections in adult dogs are sub-clinical. Young dogs can develop a diarrhea syndrome characterized by the passage of large volumes of foul-smelling, watery (or "cow pie") stools. Diarrhea may be acute or chronic, intermittent or persistent, and may be accompanied by weight loss.

Causes

Dogs acquire the infection by drinking water from streams and other sources that are contaminated with infective oocysts.

Diagnosis

Diagnosis is made by finding the protozoan or its characteristic oocysys in saline smears of fresh stool. Smears from rectal swabs are satisfactory. A negative smear does not exclude giardia, as oocysys are shed only intermittently.

Three negative rectal smears collected at least two days apart should be obtained before the diagnosis is excluded. Serology tests (ELISA, IFA) are now available.

Treatment

Giardiasis responds well to Flagyl (metronidazole). Because Flagyl causes developmental malformations in the fetus, it should not be administered to pregnant females. Other effective drugs are available. There is now a vaccine available for giardiasis, but this is rarely recommended because the disease is usually mild and responds well to treatment.

Prevention

Prevent your dog from drinking unclean water.

Support

Please contact your veterinarian if you suspect your pet may be infected with this condition.

Show Sources & Contributors +

Sources

Dog Owners Home Veterinary Handbook

Publisher: Wiley Publishing, 2007

Website: http://www.wiley.com/WileyCDA/

Authors: Debra M. Eldredge, Liisa D. Carlson, Delbert G. Carlson, James M. Giffen MD

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