Looking for Dog Trainer

I don’t live in Seattle yet, but I’m planning on moving by the end of the year. I have an 8 year old dog who is dog aggressive. He no longer reacts severely on walks, but I still would like to find a specialized dog trainer who can work with him to relieve the stress he has about other animals and public settings.
If anyone has recommendations (with price points so I can create a specific budget) that would be great!