It's something I will never understand... a pet is nothing like having a child.
You can rehome a pet, they only live a short time, you can lock them in a room with food, water, and the radio on and go out for hours with your friends, etc... it's in NO WAY comparable to the hard work and sacrifice of children.
On the flip side, dogs for instance live in a perpetual state of having a 3-year-old mentality, so it is half like having a toddler.
While they aren't as hard to care for because how you care for them far more lapsed (SS aren't going to take your dog if you go to work and leave it home alone) they do forever act like toddlers when they destroy things, don't talk, run around like nutters, need their shit cleaning and never gain self-sufficiency.
That's why I'm always baffled by my 'childfree by choice' friends all having 'fur babies'.
They claim they don't have kids because they are 'too selfish' but you just give yourself a pre-schooler to look after for 12-16 bloody years the only plus is you can put it in a crate or if you really must drop it at the shelter (and that's the crux of it really, it's not being too selfish it's a lack of true commitment to see it through and knowing you have the option to bail).
I'd much rather go through a hard time of having a baby and watch it blossom into a great self-sufficient person who I cant chat to and watch their long life journey until my death (which is how most child-rearing goes).
Rather that than pick up the shit from a drooling slowly deteriorating furball that limits my ability to have a free and spontaneous life for a decade and a half then being sad when I inevitably have to make the choice to kill it because it has no quality of life left.