Once home to the Detroit Tigers, the corner of Michigan Avenue and Trumbull Street has now gone to the dogs. The old block that housed the iconic Tiger Stadium, where six World Series were played, has been vacant since the building was demolished in 2009. But once a month, the area teems with activity when scores of pooches and their owners descend on the space for a regular “pop-up dog party.” After all, it’s the perfect spot for a herd of canines: It’s big, it’s grassy and, most important, it’s fully fenced in. For now, the stadium site is a temporary stand-in. Detroit dog lovers are raising money for a permanent dog park nearby. As for the old baseball field, plans for the city-owned land remain up in the air.