In addition to the other advice: leash him inside and reward him for appropriate behavior so he learns to be a follower instead of an 8 month old brat. Tons of exercise alternated with crate time and last but not least: NILIFF treatment.
WD is also 8 months old. He just stood by me as I am writing this, nipping my jeans with his little teeth and looking for my response. He hasn't had a lot of exercise due to a sore foot.
I envision him as an old dog and I know I will miss today.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015