Help needed please, I have a 12 week Labradoodle which we have had a week. Yesterday we got a 8 week Cockapoo. We thought they would get on as both being pups, the 12 week old is biting the pup, starts off nice than quite rough. The 8 week old has a go back, but is only small in comparison. What can we do? Keep trying them together, but then have to put them in different rooms. 1 male 1 female.