So glad you are willing to work on this!!!
I agree with everyone. It sounds like Scottie needs more exercise and mental stimulation.
Take him on longer walks and play more with him in the yard. Flirt poles are fabulous toys that can tire dogs out really quickly. Plus you can make your own for $15-$20!
For mental stimulation I would start out with some treat dispensing toys like kongs, tug-a-jug, custer cubes, etc. There are so many good ones available now. You can also clicker train, train basic commands (sit, down, stay, etc) or even play some tracking games (
Scent tracking). I play some of the beginner games here with my dogs and the LOVE it. And like said by other's Kikopups youtube videos are really good how to's for training!
With more exercise and mental stimulation I really think you will see an improvement.