Recently read on here, that dogs prefer their own breed, might be worth checking out.
Our Caleb's about 10 months and we've just added a pup to our family. He too is so well behaved, a real gent, and we had the same fears as you.
It's gone so well. By greeting him first, extra praise for him, putting him first in everything...feeding, petting,play,etc.. It's worked out well. He was unsettled for 3 days, but soon saw he hadn't lost his place.
He adores her and she adores him. He searches her out now and wants to cuddle up with her (except at night -she's crated) So I'd say go for it. Watching them play together is such a joy. Yours is a great age for a play mate.
Good luck
__________________ Caleb   Pippi |