Hey! I had a dog growing up and we were told by the people we bought her from that she was Lab/GSD mix but I've always doubted the GSD part because I thought she would be larger. She only weighed about 40-50 pounds, she was very petite and had short legs. Here are some pics of her..sorry they are so small (i already had them saved on my comp that size). If you need a bigger pic to figure it out I can re-scan them.
The first one was when she was about 5-6 and the second is when she was 8 weeks old.