Is this a duplicate of the post from yesterday/day before? What happened to that thread?
GSD's are as hyper as you make them. If you do not exercize them both mentally and physically, they can come "off" as a high energy/hyper dog. I work mine everyday and when shes working she's high drive or what seems "high energy", but when its couch time, she switches off, and will lay on the couch with me all night. If I did not work her everyday I imagine she would be a fiery ball of energy inside.
Shedding isnt bad. They blow coat twice a year usually and for that month its kinda crazy, but nothing routine vaccuming can't solve.