Eddie,as you can see from my avatar, My Gilligan jumps up on me, but he will only do it when asked, never other wise, he is 10.5 stone and would knock over the unsuspecting, so being really strict is imperative, this is a bit of a trick to show the height of a wolfie and most wolfies will do this, however, a lab is also a big heavy dog and should never be permitted to do this unless you specifically want this but not a good idea really!!
Every time he jumps up, you must immediately push him down and with a quick but firm reprimand.
Remember there are no circumstances to which he is permitted to jump up.