We have a mare on the ranch that is a mixed breed pony and she has, for the past four years, acted like a stallion around other mares. She snorts and bites at their flanks, and totally acts like she's going to breed the other mare. We haven't thought much about it and there's no real harm done, I'm just wondering if anyone could tell me why she does it? She didn't start til she was about 14 and now she's 18 and ever since 14 she's always done this with other mares. She's also a total brat to other horses too, like all the geldings and she guards her mares like a stallion would do, keeping all other horses away from his mare.
Anyone know what would cause this change?