Have you tried using a dead goose. I have a couple frozen goose wings from earlier this year and my buddies hooked me up with a couple more. I take the wing out and start training with a bumper. Then I transition into a frozen wing. I also have a frozen duck. We work with that every once in a while. My hunting partner has a couple of live ducks. We tie their wings back with a piece of a garbage bag. You can start by letting the duck loose in the yard and teasing the dog with it. Then pick up the duck and tease the dog with it, waving in front of their face. Then throw the duck out and let the dog chase it. Make sure the dog picks it up and brings it back. You don't want the dog playing with it or chewing on it. They call this making your dog "Birdy". Only toss the duck a couple of times. You don't want to over-retrieve your dog and you want the duck for further retrieves. A couple of tosses and the duck just lays there. See if that helps. I also recommend 10 minute retriever. It's a great book and very easy to follow along. Good luck.