Ok guys. Bear with me. I am new to this. I have an 8 month old female lab. She has been a little slower than other pups that I have worked with. Her obeideience is solid. She knows what fetch is . She has been retrieving like a champ. Her desire for retrieving has been solid. Two weeks ago she was retrieving like a champ. All of the sudden after about 10 solid and near perfect retreives. She tucks her tail. Hides behind my legs and refuses. I have managed on different days to get good retreives from her. But after a few the same happens. I have not used a collar on her. Nor have I had to use anything other than harsh words to get obeince. Her personality seems to be more timid than what I've seen out of other labs.and wonder how I can get her through this or if I should break down and begin her on forced retreiver training. I am an amateur and only want a solid hunting dog.