[ffdfriendforurr]

I agree with just keeping him seperate, as well as working on the 'watch me' and 'leave it' commands with him. If hes just not going to get along with other dogs trying to atleast make him 'ignore' them when they are present is the next best thing.
I think those commands would help with his anxiety you mentioned as well. Getting his focus on you when hes anxious and then doing basic obediance things would help build confidence as well as keep him focused on you as opposed to the other dog.
Just my thoughts though. He looks adorable from the pic small head short ears and all