Can anyone guess my dogs Breeds, She's mixed..?

[petra_babe18]

When i adopted her, At the humane society, they guessed she was half German Sheperd, I'm getting her a test kit next month because i'm curious. She's 49 pounds, Great jumper, I've seen her jump over 4 foot fence with no problem, and she yips like a coyote when she plays lol. Very calm, very smart and super submissive. Her are links to to her pics,I just want to get some opinions on what she might be before i test her.

http://i6.photobucket.com/albums/y245/petrababe/P1000137.jpg
http://i6.photobucket.com/albums/y245/petrababe/P1000219.jpg
http://i6.photobucket.com/albums/y245/petrababe/P1000263.jpg
http://i6.photobucket.com/albums/y245/petrababe/P1000131.jpg