Koko had to have both CCL's repaired at age one year. She is a big dog but not over weight at 100 lb. Both of her knees gave out because of Hip dysplasia. They say when one Knee goes, when the hips are involved, both will go. The local ortho Vet wanted to do TPLO so I took her to Auburn Univ because they do the Fishing line type and TPLO. Since her surgery her Knees are as good as new. When a low pressure comes in, that brings rain, she usually has that pained look because of arthritis in her hips. They did not recommend surgery for her hips so we give her Glucosamine, Chondroitin, and Msm as a daily supplement. I give her aspirin or Remidal when she is in pain. I do not advise having TPLO there are to many risk.