The whole point of the Precepts is to try and do as little harm as possible.
It's not possible to do no harm. Even by breathing in we kill microbes.
We just do the best we can and try as much as possible to try and minimize harm.
We have to accept that suffering exists. Where we live, is a much different climate than we used to be used to, my spouse and I.
We came from a hot, dry place.
Here, there are lots of fleas, that get on our pets and we have to kill them.
Otherwise we'd have a flea infestation, and our cat, "Boy" would be constantly itching, and his hair falling out as he is extremely allergic to them.
We have to have compassion for them, and for ourselves, and not allow an infestation.
If there was a sure way to capture fleas and release them, we would do that, but as it stands, Frontline Spray is the only method that really works and is safe enough for the animals to use on them on a regular basis.
That's part of the nature of the animal world, if you are an insect, you may likely end up in the wrong place that is not out in nature.
There's no judgment involved there, we love the Buddha Nature in them, however we can't responsibly let them in the house and get on our animals and pets.
There's no avoiding the harm, without doing an even greater one.
It wouldn't be kind to our cats or ourselves to let them be in the house, our cat Boy was covered in sores from scratching and hair falling out before we got them contained.
Just bow to it. Accept the harm and be grateful, and not full of animosity, or hate or judgement.
Try and do as little harm as possible, but realize that you may have to do some.
And just accept that, with gratitude.
"Life is full of suffering. AND Life is full of the Eternal
IT IS OUR CHOICE
We can stand in our shadow, and wallow in the darkness,
We can turn around.
It is OUR choice." -Rev. Basil
" ...out of fear, even the good harm one another. " -Rev. Dazui MacPhillamy