Giardiasis in dogs is caused by a protozoan of the giardia species. Dogs acquire the infection by drinking water from streams and other sources that are contaminated with infective cysts. 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 sometime mucoid stools. The diarrhea maybe acute or chronic, intermittent or persistent, and may be accompanied by sudden weight loss.

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