Q. Our 6 year old lab that is in great physical shape has thrown up 5 or six times in the last two days. He's had the same food for years.

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A. Clearly this isn't normal for him, and 2 days of vomiting signals that something is off. He could have an infection in his GI tract (caused by parasites, bacteria, or a virus), a blockage or partial blockage there, or a more serious systemic illness involving the kidneys or liver. I would definitely take him in to the vet for a complete physical exam and possibly some testing, so that treatment can be started to address the primary problem.

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