What is my puppy mixed with? - Page 1

I adopted my puppy Kira from a high kill shelter at the end of May. They could not tell me much about her or what she is mixed with. The only thing they knew was she is a GSD mix. She had 2 sisters and 1 brother. Her one sister and brother had about the same coloring but her other sister had blue eyes and a blue silver-gray brindle coat. Very pretty! Here is a little of her temperament: She is very loving, mellow, smart, learns quickly, does not challenge who the boss is, loves playing , gets along great with all animals, my children, not hyper or over active, likes swimming in water, very people friendly yet protective of us. She is such a wonderful dog. I just can't figure out where the brindle is from. She does not appear to have any bully breed in her or boxer/Dane traits/appearances. She does not seem like she will get over 80-90lbs at most. The pictures of her outside is when she was about 4-5 months and weighed about 25lbs. The picture of her next to the chair is current and she is about 6--7 months and weighing about 35-40lbs. I am hoping someone can help us figure out what she is mixed with. She is our baby and we are very very happy to have her in our lives!