I have a 13 yr old paint mare. She has always be slightly aggressive towards other horses. Anytime while riding if someone would pass us she will pin her ears and give what I call her “mare face”. She has been known to kick in the field if prompted by another horse but recently she became very aggressive towards another gelding at our farm. She has kicked him once before given that was due to him biting her rump.
However the past two rides I’ve had on her with him in the arena she attempts to charge him and mostly recently while passing him (which is the odd part) I felt a kick coming and attempted to move her hindquarters over but she refused to and kicked him in the shoulder while cantering past him. This is not normal behavior and charging other horses is not either.
I was wondering if anyone had any tips to correct this or what could cause the sudden onset. We’ve decided to keep her out of any rides with other horses as I fear for other horses and riders safety. She was completely unproved in doing this as well cause he actually moved out of her way like he knew what was coming. The gelding is now completely terrified of her as well. We’ve been working her with ground driving to get used to things directly in behind and touching her sides but does anyone have other tips or tricks? I love to show and so does she so it hurts us both to not be able to do it. She also has not offered to kick when trail riding in close proximity to others it’s mostly just in the arena.