I don't think you can "teach" a dog to jump; you can help it along and build it's confidence up, but some dogs are natural jumpers, some are not. The two I have just now; one will go out of it's way to jump, but the other will only jump when it's neccessary, prefering to go under, thru' or around, if it can. My 29" Deer X bitch "jumps for fun" and frightens the life out of me when she takes barbed wire at full speed, but I like to see a dog jumping when in pursuit.
Cheers.