I don't see the link between this furry stuff and bestiality.
I like these furry pictures (well-drawn, simple, fantasy figures who have sex with other fantasy figures), but they don't awake any real sexual arousal in me. They're entertaining and feed the fantasy, but that's about it.

Real bestiality, however, is something else. It depicts another human being engaged in sexual activity of some kind with a lower lifeform. Seeing a woman having pleasure from getting fucked by a dog, stallion, boar or other male animal, can arouse me immensely from time to time (not always).
It's the full surrender of the girl to the will of the animal that makes these scenes highly enjoyable and hot to watch. In this way, it's not so very different from a lot of other porn being made and watched.