Does anyone know the side effects of using heartworm prevention (such as Revolution or HeartGuard) on a heartworm positive dog? I know they can have mild or severe reactions, but can someone give me examples of which kinds of mild or severe reactions could occur?

Thanks!

P.S. I am just curious, my dog does not have heartworm.

The question was answered by :
doc's wife :
The worry is that if the prev. kills any active heartworm- it could break off, leave the heart and travel to the lungs, causing a PE.

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