Originally Posted by Hoofprints on my heart
Take him to shows, trail rides, different stables anything to get him away from his buddy so that they arnt so attached. I suggest lunging him either before you take him over to the show grouns or after you get there in a warm up ring. He needs to keep focused and getting a little energy out wont matter. I also suggest that the oowner of the other horse takes him off the premises so that your horse gets that he can go alone and it wont hurt him.
Hope this helps!!
I am trailering him to my lessons once a week, and he's fine with that, so that should help.
The problem is that it's my sister's horse, they live together, and she wants to go to the shows too.