London's most refined canines and their humans are gearing up for the Pets and Wellness Society's annual dog show—and Betty Wentworth, favorite aunt to Scarlett's fiancé Harrison and proud owner of corgi front-runner Freddy, knows that this could be their year with the right edge. Never one to turn away a corgi in need, Scarlett convinces her milliner cousin, Vivian, to design matching hats for dream team Betty and Freddy as they compete for Best in Show. It's a tail wagging good time until the dog-food sponsor of the event is found dead and Betty is the prime suspect. Vivian and Scarlett agree to enter the competition in Betty's place and help Harrison catch the real killer before Betty is collared for a crime she didn't commit.