Dogs are welcome at Franklin State Forest in Massachusetts. This 843-acre park is under-developed to preserve the beauty of nature, and can be explored on the numerous miles of trails and fire roads that weave around the area. You and Fido can also access the Southern New England Trunkline Trail, a 22-mile, pet-friendly trail through Franklin and beyond. Dogs are welcome to join their owners throughout the park on a leash under six feet, as long as all mess is cleaned up after them. The park is open every day of the week from dawn until dusk.