Ok, so my lab is on his 2 season and has many retrieves under his belt. But, at the end of this season he started not marking falls as well and waits to be sent on a blind then looks back at me to be casted. If we are hunting in open water with no vegetation he does much better. But, if there is any vegetation like grass and lilly pads he just waits for the blind. Any ideas what I can do to break this? Im assuming more marks. Any suggestion will be appreciated.