I'd say, read your own words--*used the wrong way* but even still, I doubt it. The seller had to say that because it'sthe FDA's orders that they do so. Just ask parazapper.

And if they both had heart worms (around the same dog), then yes, they'd both have heart problems. The most that would happen is the worms dying in the heart reacted to being zapped in a way that they felt, but that wouldn't be bad, just proof they were there and being killed. And not knowing that, they felt the reaction and rushed off to the doctor, who would have diagnosed the problem had they come in before zapping.

And I don't care what you do. If you wait, guaranteed your heat muscles will just get eaten by worms more, and just get weaker and weaker. But it has no impact on me one way or the other.