Quote:
Originally Posted by BunYip
My vet told me something diferent. Something about the oxygen being displacded by something else in the heamoglobin.
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You are both correct. The onions metabolites cause a change in hemoglobin precipitates ( sulfhemoglobin) which in turn causes the red blood cells to become fragile and prone to rupture aka hemolysis or the breaking down of blood cells.