Attention, Labrador lovers: The largest Lab show in the world—the Labrador Retriever Club of the Potomac Specialty Show—starts Tuesday in Frederick. The event runs through April 11 at the Francis Key Holiday Inn (5400 Holiday Dr., Frederick). Around 1,200 nationally ranked dogs will compete in the four-day sporting event, which is sanctioned by the American Kennel Club. In addition to competitions in obedience and appearance, the show also features seminars on Lab behavior, health exams for dogs conducted by canine cardiologists, and a silent auction. All proceeds will go to Lab Rescue of the LRCP, a volunteer group that has rescued and placed more than 1,000 dogs in new homes. Says Vicky Creamer, president of the LRCP: “In the Lab world, this annual show is our Super Bowl.” All events are free and open to the public. For more information, visit the Labrador Retriever Club’s website.