hey guys,can any of you help me out and tel me if i could introduce a new guinea pig to my 2 and a half year old guy?i regret ever taking him on his own because i always think hes lonely and sad and would love a friend but iv been told its 2 late that hes probably quite terretorial and they would not get along?is this true?hes such a quite boy,he doesnt play,he just sits around and eats,id hate to think hes unhappy,advice greatly appreciated =)