My bitch collie grey is now 2, she used to be a great working dog and a pleasure to watch work day and night, and all of a sudden she's just jacked it! Go near a enter acne of a feild she cowers and if off her lead she will run and hide or lie down, I've tried walking into feild right up into sitters and when they get up and run she just turns her nose and doesn't want to know anymore. This has only been going on for the last month and a half and I have gave her no reason to act like this seriously do not know what is up for her, I never gave her hard slips or anything close to hedges/fences t