Don't do it, if the other horses aren't locked up. I know people who do it, but I have saw the damage done. My kids safe mare and I was riding in the pasture with another kid safe mare, plus an yearling and two other horses. When the loose horses saw us pick up speed, they didn't to join and how horses decided it was play time. I was 13 at the time and now have a scar that goes down my arm, down my chest and to my pant line. Never again have I really rode in the pasture unless I was bareback. My pasture is my arena, but my horses get locked up, when I ride in it.
Extreme Trail Rider and Barrel Racer.
King - 11 year old Tennessee Walker Gelding
Sassie- 7 Year old Appaloosa Mare