Okay, here's my 2 cents (Canadian) worth ...

First, bestiality is an ages old fantasy that must have roots in reality. Look at Greek myths for example. The Brothers Grimmm are subject to interpretation. And who has not heard the expression "hung like a horse" ... which brings me to the lore about Catherine the Great of Russia. Her love of horses - fantasy to knock a very powerful woman? Her bedding the horse guard is well known ... is there a reality involved.

Next up: animal play. I have participated in pony girl training and play. Now, is that a form of bestiality or its own kink? I know several subbies who want to be kittens, puppies, ponies ...

Moving right along ... last night's episode of CSI featured P & F ... plushies and furries. People who let their inner animal free. Some of whom don costumes to look like the animal of their particular fetish. Which brings to mnind the fact that ancient peoples everywhere donned animal skins and acted like animals as part of hunting ritual, war behaviour, etc. The Maya, highly civilized folk in many ways, are an excellent example.

lycanthropy. Another well documented legend in many cultures.

Which leads me to ..
There is a site, called ZetaCreations, which makes animal dildos, in assorted shapes and sizes, and not limited to real animals, but including at least one dragon penis! Could help to live out some of those fantasies without actually dealing with the unpredictability of an animal.
The dildoes are shaped like the animal? Or are the dildoes shaped like the animal's genitals? Makes a big difference!

Finally, for those lovely lasses who have bestiality fantasies, feel free to send me a Private Message. After all, my name is ...