BOSTON — Fresh from his World Series workout, Rick Porcello was far from dog tired. So the Red Sox pitcher took his new puppy for a romp at a popular park — Fenway Park. Porcello watched in amusement as 4-month-old Bronco the German shepherd explored the yard Sunday. The pup sniffed outside the Boston dugout, zig-zagged across the outfield grass and ran next to the Green Monster. “I got him a couple days before the playoffs,” Porcello said.