Re: Please please help this is discusting
I'm not sure I want to know the answer to this, but how on earth did you discover that she's being abused? Do you have CCTV?
I think Kevin's right, you must report this pervert and if the police won't do anything, go to the papers and charities like the RSPCA.
If you have a couple of big burly mates, I would lay in wait for him in the stable and scare him off but obviously don't do this on your own!
One other thought - do you know anybody with a vicious horse? Perhaps you could switch fields for the night? If you live near Exeter, you can borrow Munchie - any one who tried to do that to him would be singing soprano for the rest of his life! He's not vicious in day to day handling but he's not great with men.
Please keep us posted, I hope you and your mare are not too traumatised.