I can relate to your worry! We took in a female stray ( Abby?10mo.) into our home this past summer & we have a 3 yr. old male named Buddy . Well they played great together outside but for several weeks my dog Buddy was really put out - he slept outside for 2 nights because he wouldn't come in!LOL And then Buddy didn't want to eat with Abby around.
So I gave Buddy some special time alone and after they figured out who was alpha it has worked out good. 90% of the time they are good buddy's and somedays they won't even go near each other! And many times I thought this isn't working but several people on here said to take it slow and it will work.