The best thing you can do is be a strong leader. It will give your dog more confidence and that can help them to be less fearful. The worst thing you could do is give "love" in the form of petting or telling the dog "it's okay" when they're afraid. That is actually praising them for being fearful.
I would teach basic obedience, because that can also give the dog more confidence and help them see you as the leader. You could try some mentally stimulationg games (a treat ball would probably be really good) to give your dog something to do when he would normally be turning in circles or glued to your side.
You can also teach your dog "place". It's basically a down stay at a specific spot, like a blanket and you can give them something to keep them busy like a kong stuffed with peanut butter or a bone to chew on. That will give him something to do that will be positive.
I would teach basic obedience, because that can also give the dog more confidence and help them see you as the leader. You could try some mentally stimulationg games (a treat ball would probably be really good) to give your dog something to do when he would normally be turning in circles or glued to your side.
You can also teach your dog "place". It's basically a down stay at a specific spot, like a blanket and you can give them something to keep them busy like a kong stuffed with peanut butter or a bone to chew on. That will give him something to do that will be positive.