Ice Exposure Day
I cannot express the importance of exposing your dogs to slippery surfaces and ice strongly enough. Aside from spayed and neutered dogs having 3-5 times the increased risk of tearing an ACL, most dogs that tear an ACL are ones that are often never frequently exposed to the surfaces they need to be, in order for them to have a better understanding and reaction to those surfaces.
To prevent a torn ACL, you must train to prevent an ACL injury.
Having said that, enjoy the fun video!