How high can a golden retriever jump?

Okay, I know that a Jack Russel can jump FIVE times his/her height and that a German Shepherd can only jump three times his/her height. But, that's not what I want to know! I want to know the same thing as you! Ive seen my European Golden jump at least two times his height but he has jumped higher I just can't get him to do it. PLEASE LET ME KNOW IF YOU FIND THE ANSWER!! I am DYING to know!! My Email is:sportyg1947@Yahoo.com!