Found this:
Dog Game: Teach your dog how to play hide-n-seek to liven up their day! Start by having lots of treats available. Choose one word for the game such as "seek". Tell you dog to seek and then drop a treat on the floor near him. Do this several times until you can start moving the treat farther and farther away. Be sure to make your dog sit and stay until you have said the designated word. Eventually move the treat into another room and, even harder still, eventually hiding it in places for your dog to search it out. This can also be an effective training tool for distracting dogs from unwanted behavior such as digging, chewing, barking, and even anxiety upon you leaving.
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