A guy is driving around the back woods of Montana, and he sees a sign in front of a broken down shanty-style house: Talking Dog For Sale. He rings the bell, and the owner appears and tells him the dog is in the backyard. The guy goes into the backyard and sees a nice looking Labrador retriever sitting there. ""You talk?"" he asks. ... ""Yep,"" the Lab replies. After the guy recovers from the shock of hearing a dog talk, he says ""So, what's your story?"" The Lab looks up and says, ""Well, I disc…