Share 'Playmate for Frankie?'

Hi, I currently have a 11 month old male Staffordshire Bull Terrier named Frankie and I am looking for a companion for him. He's great with other dogs, never shown any aggression toward other animals. He regularly plays with a friend's Golden Retriever and Labrador and they get along great(I have considered getting a Golden, but I am a true lover of the "bully" breed). My question is, how active…