My eleven month old female comes back with the dummy and wants to keep it on the ground so she can chew it. I have to lift up on the collar to get her to sit, hold and deliver. Just started force-fetch with minimal pressure (I like Robert Milner's method) and she's coming along pretty well. After a session, to relieve tension and let her have some fun, I give her a few retrieves in the back yard and it doesn't seem to be changing at all. Will the FF work for this, or does anyone have any other suggestions?