has anyone ever had a sway backed yearling?  She's actually only 10 months old right now, she's been showing signs of this for several months,but I just keep ignoring it.  I've read online about 1% of foals get this.

is there anything I can do?  She's on alfalfa hay, and oat hay, a good vitamin, also added magnesium, selenium and vitamin e with some liquid iron a couple times a week.

ive started doing belly lifts on her, she comes up about 50% of where she should come to, then drops back down.

is there any hope of her getting better?  I've raised three other foals out of her dam, they're all fine.  Her sire looks fine, I'm at a loss of what else to do.  This isn't the best picture of her, she isn't just but high.

any experiences or recommendations would sure be appreciated.

Unfortunately, there isn't really anything that you can do for a sway back. But don't lose hope yet! While you will have a difficult time fitting a saddle and pad...I've known some very nice sway backed horses that could hold their own on the track and in the arena  =] 

We had a swaybacked horse and I don't even call your yearling swaybacked.  There's a term called saddlebacked that would fit better.   A horse I owned with a back like that just needed a little extra well-fitted padding so the saddle wouldn't rub.  

I have to agree.. I don't call this sway backed at all.. ( JMO)

There is a lady who has an e book that tells you how to build true core strength in your horse.  Although you will probably not want to train the way she does, this core work is for all horse, no matter the kind of training. By this I mean pressure/release (traditional training, -R) or +R (positive reinforcement). This starts on the ground and gradually builds to under saddle and mounted. I think it’s Intrinzen.com. 

totally agree... strengthening the back through things like ground poles and aids like Long line reins, chambon or equiami will help him a ton. Id definitely talk to someone that trains dressage horses!  

I'm encouraged reading yalls posts this morning.  I'll check into your recommendations, I thought she was done.  Thank you for sharing your information, it really is appreciated.

This is actually something different. It is teaching the horse to lift his cervical vertebrae (lifting the withers) and also “crunches” for a lack of better term. You do this standing and then on slopes, with a saddle and then with weights, etc.  Kind of in addition to poles, etc. but without the training aids you mentioned.