nina ottosson dog worker composite 8Dog Worker Composite That's work! For beginners to advanced puzzlers. The Dog Worker is an innovative game by Nina Ottosson that puts the dog to work. Beginner (1): Place treats in the recesses under the spinning disc and under the tubes without a rim. Let the dog find the treats by picking up the tubes and spinning the disc. Advanced (2): Unscrew the turntable and put treats in all the tubes (including the ones with a rim). Your dog can then find the