I just got a new horse this past February and he WILL NOT pick up the right lead at the canter under saddle. When I lunge him or if he's out in the pasture he will pick up the right lead without a fuss although it's obvious he does favor his left lead. His previous owners of 7 years bought him as a trail horse but he really ended up being a pasture pet. When I got him he was just really unconditioned and I used that as an excuse for him not picking up his right lead (at that point he wouldn't even do it on the lunge line). But now he's in good shape so why won't he pick up that lead? I've been working him on a circle so he's flexed to the inside and I've even used a jump to try to get him to land on the correct lead...but no luck. On the off chance that he does pick up the right lead he'll break into a trot after a few strides and pick up the left... HELP!