I've lost two mallards this season because my 18 month old Lab Luna chased them. Today, she actually had the bird in her mouth but it slipped out and then started flying low and hard. In both cases I couldn't take the shot because she was right on its tail.
For upland birds it seems to make sense to allow her to chase the bird so that she keeps track of it. In some cases that also might make sense for ducks. Maybe I'm wrong though.
I need some sort of a command like "freeze" so that I can stop her in her tracks if I need her to. What do you folks use?