It's hard to get a good impression from those pictures, however, my first impression is that it's probably a kitchen sink. The ears look similar to lab/golden retriever. The mottling on the tail shows a colour that is typical of a german shepherd. My thinking, therefore, is that the basic mix is probably a lab/golden + german shepherd. Here is a picture of a "golden herder" that I plucked off of google. Does that look right?
The images are little blurry but almost looks like the dog I just got from the shelter. I think I've determined mine is ridgeback hound miniature lab mix. There is a lot of extra skin on the neck and around the joins, in the right light it almost looks like gills or lines in the fur, I see it in your second picture. I think mine is between 1 and 2 years old so fully grown @ 43 pounds.