I should've been more clear about the 'lameness.' It's rather a stiffness that he'll work out of as you ride, probably from his racing past. He also hates cantering indoor, which may be a major factor in the misbehavior. He was doing better outdoors, when weather permitted, and free lunging. So all in all, the horse is definitely not lame in the 'can't be ridden' sense.
I don't mind working on his training, since there is a more experienced student who is willing to come and help out from time to time.
From what I know, the owner is not up to really training him on her own and doesn't seem to plan on having him vetted (since it was never an issue until we were cantering indoors). I'm basically the only English rider at the barn, everyone else does Western with their horses. So pretty much, this is my only option since this horse has had English training sometime in his past (which he seems to have managed to forget by now lol). There is no other place for miles (I'm kind of in the middle of nowhere with people keeping horses in their backyards, Western country).
My half lease (or partial lease, call it what you want) is a flat fee for 3 days per week. I do not pay for vet bills or any other expenses, unless of course I caused something.
Can anybody give me an estimate? Board is approximately $375 I believe.