My KMSH gaited for the first 6 months we owned her and is now out of gait... being that there aren't very many KMSH trainers in New York, does anyone suggest how to get her back into gaiting? She does not have any health issues, never lame, very sure-footed...
The horse doesn't have to be lame to have skeletal issues. Before changing bits, re-training, etc. have a good equine chiropractor look at her.
When my young TWH suddenly could hold his gait under saddle for more than 30', I had the chiropractor out.
Turns out his Atlas bone and sacrum both needed adjusted. After a week of rest, he was back to his beautiful running walk and classis head-bob.
Once you're sure there are no skeletal issues, then if the horse won't gait, look at the possibility the rider might be doing wrong, look at the bit, look at the saddle fit.
Some horses will gait if they only have three legs; others are like the Princess and the Pea story and will quit gaiting if one little thing about the rider, bit, saddle, trimming, shoes, etc. changes.
Hope this helps