I would definately not hurt them! I used to have more pets around, but now only have a small dog and a kitten. I was thinking just wear the zapper and hold them, maybe touch it to their ears or paws and see if their health improves. Zapping pets is one really neat thing the zapper can do, as they pick up parasites so easily. I think as "experimental evidence" it is a little more valuable than a person because then you can't say it was the placebo effect that helped them, it had to be the zapper.