About four months ago I started leasing a Friesian x Arab cross. She is 9 years old, and has little training. She accepts the saddle but she doesn't really accept the rider. She doesn't listen to my aids. We're working on bending and listening but when I ask her to do something she catches the bit, and ignores my aid. Then I make my aid stronger and stronger until she gives in and bends, but she pins her ears back and has a little bunny hop. Then at the trot she ignores me almost completely! She has a huge stride, and often rushes the trot. If I ask her do half-halt she holds the bit and rushes forward, pulling my hands down. Then asking her to bend at the trot is another story. She is very unbalanced at the trot, and she feels like she is going to fall flat on her side. If I try to bend her so she can get underneath herself and balance, she throws a fit and bucks. She is a very headstrong mare, who is full of herself. She throws fits all the time! She's broken her stall door, broken cross ties, broken through fences. She is very herd sour too, and will become very agitated if she is away from other horses. I've yet to have a relaxed ride with her when she doesn't listen, spooks at objects she's seen hundreds of times, and is anxious when away from other horses! Any advice to calm down and get her to stop, respect me, and listen to my aids? I'm not used to headstrong horses, so she is quite a challenge for me.
The bit I use with her is a Herm Sprenger KK Ultra Loose Ring Snaffle Bit. What I'm wondering is if she needs a stronger bit? The KK bit is the one my trainer insisted on, but I'm starting to really think that she needs a stronger bit.