Sounds like I'll just have to live with it for now. All her obedience has gone right down the drain in the past two weeks. I can't do any training whatsoever without her on a leash or check cord, and starting two days ago, can't do any retrieving outside because of all the animal droppings. I think it may be a Perfect Storm of her hitting a stubborn teenage phase at the same time the snow has melted and all the droppings becoming distractions. 4 weeks ago (at 15 weeks old), I had a dog that could be trained off leash, would sit on command at any range better than 90% of the time, would stay, and if an incentive such as a sliver of hotdog was offered, come from any distance. Retrieving was getting better each day as well. She doesn't have a lot of drive yet.
I wouldn't dare try a collar without some help, planning on joining a club to get to some training sessions. Also get her around some working dogs so she can see what the game is.
I am so frustated with this dog right now that I am ready to give up on her, at least for a while. Even her house manners have taken a huge step backwards. I think a short break will do us both some good until she comes around. I started some fairly harsh discipline with a crack on the butt with a thin rope (I don't have a heeling stick) for the NO! commands on the poop, and sharp snaps on the collar or leash and rough handling for sit, stay, come. But quickly realized that was also taking us backwards, so we just go on pleasure walks on leash for a week or so.
We've tried the lines, fences, etc. Only works during the molt. At least they are good training aids for getting her steady. As far as getting rid of the geese, popping a few is not an option. I work for the environmental regulating agency in my state, so any removal would be more than just a fine, it would probably be my job!! Within two or three weeks, we will have between 50 and 100 on the front yard at any given time.