Yes experience of two tears. Possible partial to full, Labrador and was 5 at the time, coped with pain well so we didn’t immediately know anything was wrong.
There is conservative management which is complete rest for six weeks, basically they move to toilet and that is it.
No stairs, no jumping, no walks, all slippery walking surfaces covered and remain covered ir the leg is likely to blow. Pain meds. Rarely works. Usually used for older dogs/dogs that can’t have surgery. The leg HAS to stabilise, may work in smaller and/or lighter dogs. My vet compared it to almost being a broken bone with regards to pain and healing time. It ‘fixes’ into place.
The other option is surgery. We had a TPLO. Long recovery for us, six weeks minimum, no jumping, stairs, we got runners and rugs, orthopaedic dog bed. Overall good recovery and returned to normal exercise, but we were careful.
There is also the option of conservative management and a brace, in our case the brace was £1500 and we knew our dog wouldn’t tolerate the brace (like a prosthetic leg almost). Vet said it was likely to be £2k in the bin! You need GA to X-ray the limb & measure it up etc.
For all options arthritis is very likely and supplements are good. We used Galliprant at the time.
He’s 12 now, takes Galliprant, Gabapentin, Paracetamol and Librela. He’s comfortable and vet is happy. But walks are short!
There was a study on modern flooring and the affect on dogs mobility/arthritis/ I can’t recall but it’s common sense that they are not accustomed to walking on those surfaces and haven’t been for thousands of years. Even what, 20 years ago carpet was a thing! Not tiles and wood.