I think someone else had the same problem some time ago. One thing you could try, is to be two, one if holding the leash and the other goes ahead a little bit, and then act like a fool lol..... I always end up with family telling me "please stop" but it usually works. sit down and pat on the ground and make high pitch funny "yejh ohhhh coooome here puuuupppyyy, ooohhhhh suuuuch a gooood puuuuupyyy ouuiiii" when puppy is coming the one brave person who is helping you just walks with, and then you back a little and do it over again, with a little luck, Jasmine (do I remember correct) will forget that she even has a leash and just get carried away and walk or rather jog towards you. Another thing that is good, is to use the older dog as an example, take both of them out and when Dane walks, Jasmine will probably follow, that way she sees her big brother walk on a leash and that may help. But do not wait, the sooner you start the better, most dogs act like that, but will get used to it real quick. Good Luck and please let us know how it goes.
Marit