I would say have patience. I wish I could offer better advice though, I'm sure many will.

I have 2 dogs. They come from the same mom and dad dog though, but different litters. I got Lily when Winnie was 6 months old. I was really worried how Winnie would act. She did seem a bit jealous/moody for a bit but really with the exception of one or 2 minor issues, I love seeing them together.

People will say, "Your dog doesn't need another dog, just you" but really, my 2 dogs love each other. When Lily was spayed she was groggy when I brought her home and Winnie stood over her whining, was so sad cause Lily wouldn't play. They miss each other if they are seperated and they play together so nicely.

With time and patience the 2 dogs could grow to love each other, I think most dogs go well together, depending on their backgrounds of course.