My 2 shepherds hated it if I took one and not the other! But they had lived together for years. Maybe with a new puppy it might be like a "break" for him? Having house to himself maybe? Give him lots of love! We also took in my sons dog and since they were/are a lot older, when he jumped in bed with me and they were no longer able to jump up on bed, they defiantly didn't like that! So my sons dog sleeps with my daughter and my shepherd(one has since rounded the bend to the bridge) sleeps in my room with door shut!