I have a 5 1/2 year old Aussie Shepherd (Sadie). She recently pulled and/or tore both ligaments and minicus pads in her knees. Sadie had orthopedic surgery to correct the problems and she's slowly returned to her normal "rascal" self. It has been a trying and expensive experience for both of us. The most important thing you can do is keep your dog's weight under control. I walk my dogs (I have another Aussie 4 yrs. old) every night for at least 20 minutes. Consistency is the key. Attempting to keep herding/working dogs calm so they won't hurt themselves is like taming a tornado. Walking a good start. I wish you the best of luck!