It is good to hear O/others who have had these experinces and fantasies.
i myself fantizsized about bestility for a long time (due to i was brought up on a farm partly i think). Yet, never thought it would become a reality until i was collared by one Dom who was always finding new ways to humiliate me.
Remember, i was brought up by a Domme, and during my younger years being trained as a slave (non-sexual, non-consestual) i was taught no was not an option as a slave. So, when my new Dom decided bestility was going to be a part of our relationship i did not know no was an option.
It only lasted a year, and I only had a dog lick me (front and back) to orgasm (several times in one "setting"). But, i knew of other slaves who gave dogs blow jobs and fingered female dogs.
Since i realized no was an option and subs are as much in control of what happens as the Dom/mes I have not again done bestility. i have read stories and fantaisized about watching it happen, but never wanted it where i was concerned again.