This study investigated the effects of weighted boots on horses (n=6) jumping a 1.25 m oxer fence. The horses had similar training experience and were assigned to two groups of three subjects (groups G1 and G2). All horses performed 10 jumping efforts: G1 horses made attempts 1-5 without boots and 6-10 with boots; G2 made attempts 1-5 with boots and 6-10 without boots. Data were available via sagittal plane S-VHS recordings and t test analyses focussed on limb-placement dimensions. There were no differences among performances of the horses in the horizontal plane, but there were significant differences in the vertical plane. All horses achieved significantly greater hindlimb elevation with the weighted boots (1.60 m) compared with no boots (1.46 m; P<0.05). Although not measured directly, the significantly greater elevation during the jump stride flight phase appears to be a consequence of increased kinetic energy associated with the horses' hindlimbs.