My suggestion is to take Sadie to a board certified orthopedic surgeon for a second opinion! A torn CCL in a pup can lead to severe arthritis if surgery is not done....at least that is my understanding. I don't know about "degrees" as the only torn CCLs I have had required surgery.
You can find one in your area at:
American College of Veterinary Surgeons
Surgeons do not suggest surgery unless absolutely necessary....and the cost of an evaluation is not that much...and certainly warranted in such a case in my opinion.
Good luck!