I have a 2 year old QH filly. I also have a 19 month old QH x TB gelding. As youngsters both horses got on really well and were part of a larger herd on the stud. I have since purchased my own horse property and both my youngsters are now with me. Recently my filly has decided she is the alpha. If my gelding goes to sniff around a feeder, my filly goes for him with ears pinned back and turns and kicks at him. She also does this around feed time and if I go to catch either horse. I quickly began feeding them in seperate yards, waiting until each horse had finished their meal before letting them back into the paddock. Because of this behaviour, my gelding is now very reluctant in all aspects, he is difficult to catch etc. Two nights ago my gelding went to stand in a paddock shelter. My filly went into the shelter too and decided it was her shelter. She attacked my gelding and literally booted him until he went through a post and rail fence! Thankfully my gelding is ok, just missing some hair and has a couple of welts on his offside. I immediately separated my two horses into their own paddocks. However, my filly is stressing herself out and is fence walking because she wants her mate back! My gelding and I are back at Square 1 with our catching and his anxiety is through the roof whenever anyone goes near him. I would love to be able to Join-Up with him but have no access to a round pen or secure arena, all I have is a 3.5 acre paddock. I hate separating horses as they are a herd animal. I have been thinking about adding to my herd with a horse that is very submissive but really need to sort out my alpha filly also. I have also been thinking about keeping my two horses separated but them having their own companion in the form of a sheep or alpaca (I live in Australia but desperately want a llama instead) or shetland pony. What are people's thoughts?