I would suggest when you get closer to selecting a pup from the litter you take Biggie to see how he interacts with the pup. Overall I suggest getting a girl so there are no alpha issues. Also by taking him there he will be able to help pick that pup. You will be able to see how they interact. Then you can select a pup and maybe before bringing the new pup home go back for a couple more visits so they will really know each other when the time comes to go home with the new pup.
Good luck.
__________________  Lulu will always be in my heart  |