My cousin recently adopted a dog from one of the shelters here, and is said to be a GSP / Lab also.
Here is Greddy:
Greddy by
Malorey_Animal, on Flickr
We also thought she might have some Great Dane in her, as in some pictures, she can look very much so like she has some in her.
She does act like a GSP though, and points a lot, so we do think she at least has GSP in her.