Rehab consisted of several weeks of confinement on his bed with minimal movement and NO jumping. We bought a hexagon cage (used now to protect the tomatoes from being ravaged by deer during the night!). Once the wound was fully healed we began a two, three and then four day per week Lake Superior beachwalk and swim program, all while he was fully leashed. I would peg 90% recovery at around six months. We hunted NoDak that fall.
When you sum all of this and then apply it to an older dog whose recovery interval would likely be much longer, I would say you are making the right decision.
We sure did get a LOT of pushback from Wildrose's owner, Mike Stewart. When we were assigned a replacement breeding without input or consult, I knew I would never own another Wildrose dog. When our replacement pup was diagnosed at age six with a brain tumor, that decision was reinforced further The dam "disappeared" two years after our replacement breeding.
Stewart, NOW, has hip scores performed on all his breeding stock dogs.