According to trainer Patricia McConnell, one of the biggest training mistakes you can make is to repeat commands, as in, “Sit. Sit! SIT!” rather than simply “Sit.” Cue him once, and if he fails to respond, there goes his opportunity for a treat. (The exception is when you ask him to turn down the stereo.)

When you think of the most popular dog breeds, the Labrador Retriever is likely one of the first to come…