I'm so sorry to hear about Rocky's issues. I hope Monday brings better news for you. No matter what happens though, I second the suggestion for acupuncture. It worked wonders on one of our first Shelties who had serious joint issues at age 3 from Lyme disease. Our vet, who also treated our horses with acupuncture with great results, used to treat Bandit on the hay bales in our barn while he did the horses. Bandit would just sit there with his needles, happy and calm. He'd be like a puppy again when the treatment was over. It really can work miracles. Bandit lived to age 13 happily herding our horses.
Good luck....we'll be thinking about Rocky on Monday. Please let us know how he does. Give him a pat for us!