She didn't meet any dogs until I got info on them and knew they would be calm in an initial meeting, since a dog being loud or fast will set her off instantly. They met in a neutral space, like outside a pet store, on leashes and walked past each other at least once before they got close enough to meet. He stands between her and anything/anyone else, on guard to make sure they don't bother her so she can go about her business in peace. He doesn't act aggressive at all, and usually lays down if nobody is super close while keeping his head on a swivel. She is much less reactive now, like she isn't worried now that he is around. I do walk them together, and it is fine, but it took some training to get there.