Can't teleport/move entity when i ride him

I can't teleport or move entity when i ride him : exemple : if a ride a horse (or boat , pig ... exept MinecartRideable ) and i use /tp @e[type=EntityHorse,c=1] ~ ~1 ~ or /entitydata @e[type=EntityHorse,c=1]

{Motion:[0.0,1.0,0.0]}

it's not working .