Welcome to Beemaster.
Horses and bees is not a good mixture, especially for the horses. My cows do not bother my bees, they stay about 10 feet from them. Bulls can bee different. The ones I have now do not bother them but I used to have a very smart bull that I had to keep away from my hives. He could unlock diaper pin type gate locks in seconds.
After finding a gate unlocked that I had told my granddaughter to lock the previous evening, I locked it and walked all the way around the field looking for the cows. When I got back to where I originally saw the gate open, 100 yards away, I could see my bull with his head at the gate lock. Within seconds he had it open while I was watching. Smartest bull that I have ever seen.
Jim Altmiller