I don't have kids, but if I found out that my son was beating it to furry porn I don't think I'd be able to sleep at night.
Edit: not saying that I would hate them or anything, just that it would bother me and I'd be concerned about them. Humans dressing up as animals and saying "call me Wolfy, I am a Timberwolf because that's what I associate most with" is just fucking weird. Humans are humans, we aren't another species.
There comes a point where being accepting and inclusivity goes too far, some things shouldn't be normalized, because then everything becomes normalized. I know I sound like the "being gay is unnatural" people, but what I'm talking about is humans and non-humans (as I re-read this, it's literally the plot of the Futurama episode with the Lucy Liu bot and proposition Infinity). There are people out there that love and have relationships with inanimate objects (cars, The Eiffel Tower, The Statue of Liberty, sex dolls, etc..). Should we normalize a lonely person bringing their sex doll out to a restaurant and having a date with them? At some point we're reinforcing unhealthy relationships and you have to draw the line somewhere.
I'm not saying I would hate them or disown them or anything, just that it would bother me. It's like, what if you found out that your kids watched midget amputee scat porn? Would you be like "ok that's normal, carry on!"?
I would remember why I already knew that I never wanted to know what porn my kids watch. I would only have a problem with abusive types of porn, that would require a talk about consent, respect and boundaries.