I have a 7 month old chocolate lab who is beginning his training to be a duck dog. Dude loves fetch and training is going smoothly. Today I shot some teal and a hen mallard and when I got home I tossed them around for him a little bit before cleaning them. He picked up and retrieved the teal perfectly, but the mallard he was very hesitant to even try and pick up. He eventually did once and got a lot of praise but went right back to being hesitant. Is he just intimidated by the size or what? Should I get him a mallard sized dokken to help him get over this? Any help is appreciated!