I definatley think there is Aussie in him...I have an aussie...she doesn't have a real stocky build, but the legs and the way the coat is, and the feathering at the butt...if it's not Aussie he could be border collie...but with leg structure and coloring...not so much the face...

I am not completley sure...if you can't find out....good luck with your heinz 57(thats my grandpas "political" term)