Q. We need to examine alternatives for CrCL surgery in a 9 YO cocker spaniel who may also have hip dysplasi
A. Depending on your location, you may be lucky enough to have a canine rehabilitation specialist. Usually their facility includes different forms of physio, swimming, water treadmills etc. These forms of exercise are helpful for low impact exercise to keep mobility, especially during healing but are not in any way a means to repair the ligament alone. Unfortunately, surgery is likely the best answer. You will have to discuss the circumstances which are specific to your dog's case and what is the best course.
Keeping excess weight off is always helpful. Packing extra pounds can take a toll, so keeping him trim is something you can do for him. Also consider exploring glucosamine/chondroitin/msm supplments can help with sore joints.
I did find this informative sheet that may help better explain your options in more detail"