Dog needs surgery. I did it for my 11 year old after he jumped off the bed. Surgery cost $2800 in northeast by ortho surgeon. LP was fixed at the same time. He's 100% now with no arthritis. If you don't go surgery the arthritis will fast set in and your dog will have a worse quality of life. You might want to read this article.
Yorkie Haven Rescue - Cranial Cruciate Ligament Tear Info