Archer may have led a fairly sheltered life to date and even though he is toilet trained and no doubt been an inside member of his previous family he lacks socialisation skills with other dogs. He tolerates other canines but does not know how to interact with them. It is doubtful he has had much training as he is strong on a lead but as his focus is very much on his human he will be a willing student for someone who has the proved training skills to help Archer adapt to the world