I have same issue with my dog. My dog was force fetched, and even has a soft mouth and during training she does not mouth the bumper at all, she holds the bumper very nicely. She does fine on duck, but with dove different story. Not sure what it is with dove, she just can’t resist those little soft, delicate, irresistible birds, and the urge to have a little snack.
Plus when she fetches a dove, she gets the whole bird in her mouth, just the head poking out, those pin feathers come off in her mouth and it makes her mad at them dove. She fires on dove like she is mad when I release her, she has this look on her face like she is possessed or something. The best thing I have been able to do is teach her “easy”, she knows what this means. I teach her hold with a dove, and give her an “easy” till she holds it softly. And when she takes off after a bird I will give her an “easy” and she knows. She knows easy from duck hunting as well, if there are hazardous condition, I give her an “easy” so she does not crash the water too hard and take an underwater stump to the chest.
But really with dove, I just assume fetch my own dove. I don’t have to worry about my dog getting bit by a rattle snake, or worrying about my dog in the heat, plus I don’t like slobbery dove, I like my birds to look all pretty
.
So Molly is a duck dog, last 2 seasons I been fetching my own dove.