I just bought a 3 year old QH paint mare in October and I am currently boarding her at a friend's farm. My friend has a barn and two pastures (winter and summer). For the past couple weeks my mare has been alone in the winter pasture and occasionally in her stall in the barn. My friend's horses have been in the summer pasture. (The two pastures are separated and the horses have only seen and smelled each other from a distance) Yesterday I had to stall my horse and help move the other horses from the summer pasture down the the winter pasture for the season. After the move my friend suggested turning my mare out to see how the others would take to her. It was terrifying to say the least. My mare is super friendly and submissive to upon being turned out she slowly sauntered over to the herd to socialize and was immediately chased/kicked/and bit at. She tried fleeing as she is not a fighter but she was brutally pursued and cornered several times. I intervened after she was cornered and stalled her. We decided to try again today.. She was chased and driven off and on. The existing herd let her graze by herself for a while than they would get after her. (The existing herd consists of 4 mares and a gelding.. they are all standardbred x ponies and are smaller than my girl) The male seems to be the most aggressive when he persues her he doesn't let up when she tries to flee. The other mares will chase her a bit but let off when she runs away. I know it is normal for new horses to be chased off and for some fighting to happen in order for the new "pecking order" to be established. I'm just wondering how long will this last? Is it normal for a gelding in a herd of mares to be this aggressive with a new mare? My mare was previously kept at a farm where she was born and raised with her mother and younger brother so she is used to being with other horses. I am keeping her stalled and letting her out a couple hours a day and trying to supervise the interaction with the other horses (without interfering as much as possible). How long do you give it before you decide that two or more horses will just not get along? Any advice would help so much! Thanks!