Try googling German Shepherd breeders in Netherlands, or German Shepherd breeders list in Holland.
Try the internet.
You can get them on eBay but if you don't have an eBay account try local toy shops.
if you stick your head in their mouth you should know, try it, it worked for me :)
Keep her away from males, and try to keep her in a no carpeted aea to avoid bleeding.
German shepherd dogs love being with you and they just get lonely when you're not around. They can tell when you are going to leave and they get upset that they won't be around you. I had a German shepherd puppy and he'd get like that, whining and trying to follow you if you got far away from him. It's all right for you to leave, but you should try to leave toys and things like that for him/her, and if it's a young dog/puppy try not to leave for too long.
just try hard and figure it out
Try petfinder.com. There are MANY rottie and GSD mixes that are looking for homes
If she is spayed he is trying to assert his dominance. Dogs mount other dogs to assert their higher range in the pack. Try to discourage it to prevent fights.
Try your local breeder and type in 'GSD breeders in muskegon'
German Shepherd Dogs are not hyper all the time. If your dog is continually hyper, it is probably underexercised Try taking it for a five mile or more hike every day.
You need training to be the pack leader. Try going to this web site for pro advice.