Hello, I recently bought an 11yr old gelding. He was described as a "kids horse". He is very mellow and kind of lazy. However when I am riding in the arena and another horse is in the arena he bucks. Kind of like an annoyed buck. He does the same thing when I am leading him outside the arena and another horse is running in the arena. We turned him out with another mellow gelding thinking he wanted to play and he kicked at the other horse. Until the horse kicked him back and he backed off. I took him out and have not tried that again. He doesn't seem to like other horses but if he is away from the paddock he gets panicky and calls to the other horses. Other than that he is very easy going and rides fine. Is this a training issue? Or is just the way he is and cannot be corrected?
Thanks in advance for the help.