Ace is a new arrival, having been given up by his family to an animal shelter because they didn't have time for him. The only criticism on his owner history form was that he didn't like other dogs. We suspect this is due more toward "barrier aggression" on leash than being truly incompatible with another opposite-sex large dog who doesn't challenge him, but we'll have more information as we get to know him better. He's housebroken, lived with four kids from 11 years old up, likes to play and fetch, and is affetionate with all humans. Ace is 3 years old and around 75 pounds.