Just give him sometime and he'll be okay. What I did when i got my little one who was also a rescue was to walk her on the leash in the house first. I started taking her on very short walks. At first only a few feet and the gradually increase the distance. It helped to build her confidence now she doesn't even want to come home sometimes depending on the weather.
As for the shaking once his confidence is much stronger that will subside. The only time Brandi shakes now is unfamiliar places other than that, she no longer shakes at home anymore unless she is cold.
Once he is feeling secure, his shaking will stop. |