Maybe with teaching him to "round" his back and get him collected a little might help strengthen his back muscles...they have driving harnesses that will help do that (they have different head settings based on the horse's level of training). I would just wait and see...
Is he sound? I also noticed that front leg immediately....it looks swollen or otherwise enlarged? Does he head-bob when he trots?
Is he sound? I also noticed that front leg immediately....it looks swollen or otherwise enlarged? Does he head-bob when he trots?