3 weeks ago I took a 16mo. ylf to the vet that I was training. I contacted the owner to advise him of my concern. The dog had a "peeping" sound during heavy panting and she seemed to have picked up a limp coming from her shoulder. The vet did a lot of checks and really didn't have a answer for the "peep" because she could not duplicate it, but did find some swelling in the underside of her kneck. She felt she had a bacteria infection and perscribed a antbiotic. As far as the limp was concerned she had said that during compression she was tender in her shoulder but not on extension. She felt that she had pulled a muscle and gave some pain meds. and instructed 2 weeks of rest. I sent the her home with her owner and he did as the Dr. ordered. She said if she was not doing really well after the rest to bring back for x-rays. After the rest period the owner started back light exercise and short swims for a week. He gave me a call and said she was doing really well and felt she was ready to get back to work. He brought her by on Monday and she looked really good (a little overweight). I started her out with light duty just to make sure she was doing well, and she seemed to be. Yesterday dicided to stretch her out a little at a time and she was doing really well until we did a live flyer. Now this pup has a TON of motor, she was sent for the flyer ( 60 yd.) and she made it about 40-50 yards and crashed hard. The terain we were working on is very smooth with no hazzards. When I got to her she was limping really bad, so off to the emergency vet we go. She is still there and have not heard from the Dr. yet. Has anyone seen anything like this before? I'm really upset at this point wondering if I rushed her, but she really did look a hundred %.