I've had 3 GSD dogs now. Gunnar is 1yr old this month and has been a good dog overall, just some small bad habbits. Our biggest thing to deal with is his spastic energy at times. It's like he's the energizer bunny with A.D.D. He won't listen, won't settle down, won't regard verbal commands unless you derail his brain. I've had to resort to grabbing him when he's out of control, forcing him to lay flat on his side on the floor and tell him repeatedly to calm down in a calm voice. Then slowly release holding him down and petting him until he gets the idea that it's not ok to be spastic. It's working with small increments of success now after about 4 weeks of it. He really can't seem to control his energy. GSD's like to chew. Pressed/knotted rawhide or the Kong toys (if they'll take to 'em) are the best candidates. I've found that 2 of my 3 dogs ate those rope toys - Gunnar being the worst so he doesn't get those anymore.
But, when I've got a tennis ball - he's a totally different dog. Focused, obedient, fairly calm until you haven't thrown it for too long (in his mind). Then he gets rambunctious.
Separation anxiety can be a big issue with GSD's. Gunnar was a total indoor dog and that wasn't working out with our 3 cats (he wants to play, they don't and he won't leave 'em alone) so we spent 2 weekends putting him outside in increasing time increments. Once he became comfortable that we would be back, he improved. Now, he'll whine about us leaving but we can leave him outside for most of the day and he does fine. I couldn't leave him indoors alone though due to the cats and the potential he'd chew on something.
I believe most of that is still puppy and he'll grow out of it. Playing fetch with him for 20 minutes seems to be the best remedy when he's spastic.
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