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Nanophyetus salmincola (Salmon poisoning fluke), found in northwestern US, southwestern Canada, and other countries in the northern Pacific Rim
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Dogs eat intermediate host (raw or improperly prepared salmon and similar fish)
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Heavy infection causes intestinal inflammation. Infection is compounded by rickettsial infection carried by flukes (salmon poisoning disease).
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Alaria species, found in North America, Europe, Australia, and Japan.
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Dogs eat intermediate hosts (frogs, snakes, mice)
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Heavy infection can cause bleeding in the lungs or inflammation of the intestines (enteritis).
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Heterobilharzia americana, found in southeastern US
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Dogs are infected by a stage shed into water by snails (the intermediate host)
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Heavy infection can cause lethargy, weight loss, vomiting, and diarrhea. “Water dermatitis” may be seen where parasites enter the skin.
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Opisthorchis species, found in eastern Europe, parts of Asia; Clonorchis sinensis is closely related
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Dogs eat intermediate hosts including certain snails and fish
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Longterm presence causes thickening and fibrosis of bile and pancreatic duct walls. Severe cases have been associated with cancer in the liver or pancreas.
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Metorchis species, found in North America, Europe, former Soviet Union
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Dogs eat intermediate hosts (certain raw or undercooked fish and snails)
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