Have you flexed the knee? Any crunching or popping feeling? And swelling? Does it look like he has a hard time bending? Or does it seem like the pain is farther up or down? No matter what I would keep him calm and quiet for 10-12 days...A week never seems long enough here when I have a dog pull something. Another thing I use, which also works wonders is soaking the leg in epsom salt. I have had a dog lay in the bath to soak her sore joints previously, at first they will fight you...But for me the dog feels the comfort and will then allow. Good Luck.