I have a 4 yr old (Remington) and an 11 week old (Beretta). How do I train the puppy to do the basics especially fetch without the older one getting in the way? i try leaving Remington in the house while I'm outside with Beretta trying to teach her to fetch and bring it back to me, but Remington just sits at the door and looks out with those sad eyes! I only have a certain area to do this as it is after dark when I get home and I have to use the flood lights. If Remington is out with us and I throw the ball, of course he gets it first. What do other people with multiple dogs do to give one on one time with each dog?