Rosaryville State Park is a dog-friendly park that spans 982 acres. The centerpiece of the park is the historic, Mount Airy Mansion, which is the only area of the park that isn't pet-friendly. There are numerous trails that are accessible to dogs and their owners around the par, including some that are paved. Dogs are welcome to join their owners on a leash, as long as all mess is cleaned up after them. Rosaryville State Park is open every day of the week from sunrise to sunset.