Hi and welcome to YT
! Your new baby sounds precious - I bet you can't wait to get him home. When we brought our Marcel home, we just payed extra special attention to our older guy, Wylie. Wylie became a little needy/attention seeking for about a month, so we just supported him through that. We always give him the treats first etc, since he is the oldest. One thing to be careful of, of course, is the difference in size btwn your dogs...as you probably already know.