People who act like their furbabies are 100% suitable replacements for real kids are definitely worth making fun of, but that's about as tame as it gets. "She taught me how to be a good father, to care for and raise another" = so that guy's not even a furbaby type, he just loves his dog and wants to snort a big ol' line of reddit karma.
Go read some Reddit stories of weak-willed morons letting the internet talk them into cuckholdry and getting other men to fuck their wives, and talking about how awful they feel afterwards. And then get back to us.