Kasumi-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
First, first of all, there isn't a single person who can live without killing a living thing. Our “life” is made up of the sacrifices of countless living creatures.
Once eaten, we are able to be kept alive by receiving many “lives” from cows, pigs, and chickens to small microorganisms.
Also, once you walk, if you ride a motorcycle or car, you may even kill insects crawling on the ground by trampling on them.
Furthermore, if they see a mosquito, they kill it by clapping their hands with a snap; if they don't want to be stung, they burn mosquito coils or vape mats; if they see a cockroach, they exterminate them by injecting a cockroach jet, and set up cockroach hoihoi and boric acid dumplings. If you see a line of ants in the house, they will place an ant nest Korori...
To be honest, there is no change in the fact that we, animals, and insects all work hard to live “life.” Of course, the same goes for the dog Kasumi kept as a pet.
Apart from pets, if we say we don't care about the animals we eat or the insects we hate, it's just our reason, likes and dislikes, complacency, and selfishness...
Well, what I want to say here is not to eat anything, don't walk, don't kill insects, microorganisms, or anything, and that is impossible after all. However, we must never forget that we have received so many “lives” and are being kept alive, and we must spend our days feeling grateful for them.
I'm sure Kasumi's dog also made me notice that she learned a lot from that “life.” Hold that firmly in your heart, and suddenly notice an insect that almost trampled on you at some point, and quickly avoid it, or if there is an insect drowning in water, it doesn't matter if it starts with such a trivial matter, so I think it would be great if you could cultivate a sense of compassion for others.
Anyway, please stop regretting it. Also, please refer to the humble answers to each of the questions below.
http://blog.livedoor.jp/hasunoha_kawaguchi/archives/cat_320102.html
Kawaguchi Hidetoshi Gassho