had this issue with my first lab. Made the mistake of shooting a rabbit over her in the field before I shot a bird over her. It was January, couldn't find the birds, I like rabbit. Anyway, she just wanted to hunt rabbits for a while after that. I started bringing a bird wing with us and a few minutes before we arrived I'd open the bag and tease her with it in the car or at the parking spot. She seemed to zero in on what we were supposed to be doing. Sometimes I'd carry it with me in case she seemed lost out there. It worked for me, although she still hunts rabbits and every mouse she can find while we are out there. I guess she's just a meat dog.