My heeler very recently tore his ACL.. Any heeler people out there?? Is this common for them? He's only 3 and my baby.. He's the BEST dog anyone could ever have!!! I'm worried.. Surgery on the 31st.. New proceedure, TPLO.. Anyone who can tell me anything would be helpful.. Hints on how to keep a heeler down after surgery would also be great!! Poor little guy!!!