I have a 2.5 old lab that will do 100 yard double marks and blind retrieves as far as you can see. She duck hunted last season and picked up about 50 birds. But when we went to her first hunt test she did not even pick up a bird. She ran in a junior test and acted like she has never seen a mark before. She had a straight 75 yard mark across a ditch and she marked it. When I sent her she ran about 15 yards and made a hard left hand turn and ran liked a scolded dog for about 100 yards and I stopped her. Then I tried to handle her to the mark and she refused about 4-5 cast so then she went to the truck. That afternoon we went back and ran that same mark and she smoked it and even worked on her casting and she was fine. The next day the first mark was about 60 yards down a hill. Mark went up dog marked it and I sent her. She did the same exact thing as the day before 15 yards and hard left hand turn and running out of sight. I am sure you could see steam coming out of my ears. I called her back and onto the truck she went. I have passed 2 dogs at the senior level and 1 on the junior level and I have never seen anything like this before. I have no idea what is going on with her. Any suggestions would be great.