Zoomies:

 

Keep him calm, don't introduce him to new people, no walks, can go potty on a leash in the back yard they say. German Shepherds have pent up energy that they need to burn off and if we can't take him for walks or any of the things mentioned, they will take it upon themselves to burn off that energy, in the form of zoomies. When the zoomies kick in we can't keep up with four dogs who go along with the exercise. 

Our home is a small home with 1,100 sf, and when an 83 pound dog burns off energy in the form of zoomies with three other dogs of equal size it is pandemonium.   Keep him calm they say...that is a joke. We might as well try to put a hurricane in a mason jar.