I have a qustion for you, does people with the beastiality fetish find it appealing to watch Teratophilia? Say like Blackadders work?
If you mean
this, then I for one find nothing erotic about that. Absolute zero. I would be more likely to get turned on by watching my hairy arse in the mirror (which never happened before, and I think it would be extremely difficult, if not impossible). But if I really had to choose between the two (with gun to my head or something), yeah, I'd try my luck this way. I'm sorry, it's nothing against you or anyone else.
But more seriously, it doesn't mean anything, everyone is different. I'm probably not even typical fan of bestiality. It seems to me that many (most?) are into unrealistic fantasies, the more the merrier fuckfests, etc. One dog is boring, it needs ten dogs, and horse, and bonus points if you manage to stuff in an elephant. Again, nothing against anyone if it's their thing. These people are probably more likely to enjoy what you're describing. One unrealistic fantasy or another... it still seems quite far... but after all, it's only my (possibly completely wrong) guess.
I like my fantasies almost realistic, with limits pushed to some extent of course, but still staying mostly believable (well, sometimes I may use flexible definition of "believable", but it's nowhere near to include monsters, aliens and such). Like if in story girl runs around the town and fucks every dog she meets, it doesn't work, because I'm pretty sure nobody does that. If on the other hand she does something much much more modest in private with her beloved pet, I can believe that. I like the thought provoking aspect of it. Maybe my next door neighbour does that? Probably not, but it's possible. And no, I'm not sure if I'd even like it in reality, I never experienced it (and most likely never will have any chance to, so I don't need to worry about it too much), but it works fine as perverted fantasy.