LYCOS RETRIEVER 
Giardia: Dogs
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There is currently a commercially available vaccine against Giardia in the United States. This vaccine has been demonstrated by researchers to be effective for prevention of clinical signs of giardiasis and reduction of cyst shedding in dogs and cats. Vaccination of companion and farm animals helps not only to reduce zoonotic transmission, but ... to reduce both interspecies and intraspecies transmission.
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Many dogs infected with Giardia do not get any disease. Giardiasis, the disease caused by Giardia infection, usually results in diarrhea. Some animals with giardiasis may ... throw up. Having giardiasis a long time can cause weight loss; generally poor condition; and even death, when the disease is serious.
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After infection, it takes 5 to 12 days in dogs or 5 to 16 days in cats for Giardia to be found in the host’s stool. Diarrhea can precede the shedding of the Giardia. Infection is more common in kennel situations where animals are housed in groups.
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It is ... possible for a dog to be infected with the Giardia cysts but have no signs of the disease. It is thought that many dogs in Larimer County may be part of this "carrier" group, and never get sick or show signs at all. Cats are also potential victims of Giardia, especially those that spend a lot of time outside.
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Dogs infected with Giardia may display severe symptoms or no symptoms at all. Symptoms include: diarrhea, gas, bloating and weight loss. Dog waste from infected dogs may appear greasy, have a foul odor, or be pale in color.
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It has been estimated that 1-2% of well-cared for dogs and cats may be shedding Giardia cysts at any one time. The rate of shedding increases to ~10% in kennel or shelter environments, and infection and clinical disease are greatest in puppies and kittens, with up to 50% of puppies potentially shedding the organism at any one time.
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