The same reason people generally don't regret having kids even though the commitment and overall change of your life are much greater than what you described for dogs.
They are objectively similar in that both are a big multi-decade commitment to a living being that you chose for yourself (yes, you did choose to have the kid unless you live in a country with no birth control access) but saying something is similar is still not making a value comparison
Yeah of course you can choose the level of evaluating how things are similar. Yes they both breathe. Yes they have DNA. Both are objectively true.
Also, you keep saying value comparison like it's something I used against OP. I never mentioned anything about dog <=> child, nor did OP. I just meant that the core decision of having either is different, so it's not comparable even though you could boil it down to "you care for both".
