It can be very difficult to guard your pet against Giardia. Frequently, more than one course of therapy is needed. It is usually necessary to repeat this examination a week later and then a month later to determine whether further medication will be needed for you pet. Remember -Giardia is a parasite that does more than cause digestive upset in its victims. It also can cause permanent intestinal and organ damage which can shorten your pet's life.
Recovery is possible, assuming that the organism is identified and treated early.
Therefore, on negative test doesn't always mean your pet is free of Giardia -You can help prevent reinfection with Giardia by keeping your pets from drinking from streams or other dirty water, by placing your pet's water bowl in an area where birds are unable to drop their feces in it, and by cleaning your yard regularly.