I feel your pain Brother. My German Shepard recently tore his 2nd ACL as well. It's a huge PITA babysitting them, but when they did the operation, they actually broke the bone and repositioned it so the chances of it happening again are very slim, so hopefully he'll be good to go now. According to my Vet., many dogs have a design flaw from the factory that makes them prone to tearing their ACL. At $2500 per leg, it gets a little expensive.