Balu is a 20 month old Black Russian Terrier (purebred, but without papers). He grew up in our family with small kids an never hurt anyone. In the past six months his strong protective (guarding) instinct has kicked in and he is very protective of his family and yard and will bite strangers - on occasion even in our presence. If you are looking for a clever and powerful guard dog with a deep impressive bark, who will be totally loyal and protective to his owners, this is the dog. Unfortunately we have workwise and private - many visitors at all times of the day and it is not fair to lock Balu away constantly.