>>29390908
I think this is mostly due to NoName55 who was
>one of the first major 3D porn animators (his oldest work goes back to 2013/2014)
>one of the first major beast content animators
>one of the first to animate elizabeth with dogs (if you look up elizabeth beast content on rule34.xxx and go to the last page, his works are among the first)
And he also pumped out a lot of content over the years. A lot of other artist and animators picked up on this and it kinda became a thing.