We got this part arabian gelding last year and has always only bin with mares, he tries to mount them regularly. Now we have received another gelding and the stud want a be hase not let him near the mares. He runs him off continuously. It has been a week now and no change. Should I be concerned, the new geldin has a few superficial wounds.
Like I always said, "Mares make geldings do stupid things". Sorry only advice I have is remove the mares. I too had an Arab gelding that thought he was studly stud around his mares, I added a little pony gelding, he drove him off every chance he got. He hated other geldings if mares where around. When I got rid of the mares, he was fine with other geldings. I could go on & on, about geldings making fools of themselves around mares, but you got the picture.
I'm having this same exact problem with the gelding I adopted from a draft rescue. He came to me with a lot of ground manner issues which I addressed. But around my mares he is a complete and total "stud". He'll mount them, herd them and chase other horses that aren't a part of his herd off. It's become downright dangerous. I can't separate him from the mares because he'll take down stall walls or fences to get to them. I contacted the rescue... and I'm not going to say what they said they'd do if he got returned again. So for now I had to buy a cattle grade fence charger and I'm hoping that it keeps him away from the pony. But in my opinion this is no longer the right situation for him.
I advised the lady that operates the rescue that he has these issues and he'd do best on all gelding turn out, which I cannot offer him. Her solution, in the end, is to ship him off to an all draft foster home with mares and geldings because she's not sure that will fix the problem.
I spoke with a trainer and he advised me that in his opinion the horse retained a testicle. But the lady at the rescue says she was there and the vet took them both out. I was NEVER told that he had these dominance issues. I was told he could get pesky with other horses... but now he's mounting my 13 hand pony and chasing her 13 hand brother over fences.
And she told me that if I return him I won't be able to adopt from them again. Even though I was unaware of this issue and I fixed his ground manner problems.
My best advice would be to separate him from the mares if you can.