Sorry in advance for the long post. I just want to give some background on the problem I am having with a couple of my horses. If I cannot figure out how to fix this issue I will have to rehome one of my horses and I really don't want it to have to come to that.
Wally is my retired show horse. He is a quarter horse gelding that is about 22. He was my 1st horse (i leased horses before but he was the 1st one that was actually mine) and I really don't want to have to rehome him but he may leave me with no choice.
About 8ish years ago I rescued and hand raised a very sickly orphan foal that I named Star. The vet didnt think he would make it but he did. When he was about 5-6 months old I carefully introduced him to Wally for the 1st time. They hit it off great and were best buds. Wally basically adopted Star and helped to teach him how to be a horse. For 8 years they were inseparable. They would both panic (similar to a mare and foal) if they were separated out of sight of each other. They moved to a few different barns together and now I keep my horses at home.
A few months ago we purchased a mare for my husband to ride that we named Blaze (Wally is not really sound enough to ride anymore and star is to hot and green for a beginner). A few days after we brought home Blaze is when the problems started and they have only gotten worse since then. Wally has claimed the new mare as his and is now extremely aggressive towards Star. Wally could not care less now if I take Star away out of his sight, but if Blaze so much as goes to the opposite side of her stall (where wally cannot reach her) Wally has a panic attack and whinnies, paces, and just generally freaks out until she comes back. Wally is now completely lame from banging his legs against the bars of the fence every time Blaze moves out of reach and he has lost visible weight from the anxiety.
Wally hurting himself is bad enough, but poor Star is being torn to shreds. Star is now banished to the far corner of his stall. If he moves to where Wally can reach him, Wally will pin his ears, charge, and bite. If Star does not get away quick enough Wally will then turn around and kick full force (luckily, the fencing has blocked most of the kicks). Poor Star is at a complete loss. I feel awful for him. This is the same horse that has been his best friend since he was a baby and now anytime he so much as looks at Wally he gets attacked. Wally is a 16.3hh horse so he can really do some damage when he wants to, especially considering Star is only about 14.3hh.
Because of the way the stalls and small arena are positioned at my house (they are all connected and share sides) there is no way for me to separate the horses.
I hate to play favorites, but Star holds a very special place in my heart after hand raising him and sleeping at the barn to bottle feed him through the night when he was little. Star is also my current riding horse since Wally is retired. If I can't figure out how to fix Wally’s behavior I am going to have to rehome him. I was hoping that Wallys behavior would get better with time and once things settled down with the new horse but it has only gotten worse. I am at my last straw after going out to feed this morning and seeing the 3 new bloody gashes on Star from last night.
Any and all suggestions on what I should do are welcome. If you guys think this can be fixed please give me ideas of what to do. If you don’t think this will get better and think that rehoming Wally is in everyone’s best interest then I will have to come to terms with that and start looking for a new home for him. I am just really worried that he may severely injure Star if this is allowed to continue.