Madison and Max are two dogs of very different breeds and backgrounds. Although they’ve never met, the lucky canines have one thing in common: They both attended classic car shows this past weekend. It’s not uncommon to see dogs walking their humans at these outdoor events. In fact, at one car show over the weekend, I actually heard a spectator say it was “like being at a dog show with some cars on display.” Funny. And that’s where we were Saturday – at the Fifth Annual Main Street Memories “Wheels on the Waterfront” in beautiful downtown Port Huron, Michigan. Billed as “the fastest-growing car show in the area,” the popular event…