If you start doing that mate the dog will have trained you
So what are you meant to do then? just leave the lure sitting there? you have to pick it up at some point to continue the session.
I have this problem at the moment with my 5 1/2 month old pup, I find walking backwards calling her as she comes in helps, then when you stop she should be more or less at your feet, you take the dummy and give loads of praise, (and a tid bit if thats how you train).
if she drops it short just pick it up without making eye contact and ignore her for a minute or so, then call her over, get her e