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What chemical in onions causes hemolytic anemia in dogs?

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Sodium n-proplylthiosulfate is one of the substances implicated in the anemia associated with onions.

I am not sure what natural occuring agent in onions causes  hemolytic/Heinz body anemia.  Maybe someone else here will.   I just know that onions in general  (as well as Acetominophen (tylenol) and benzocain-containing topical preperations) are the only substances which can cause Heinz body anemia.

Please don't feed them to your dogs in any form...

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