Not a mal. The blocky head could come from a number of other breeds. Could be GSD with rottweiler or boxer (which would also be consistent with the brindling). Body shot would be more revealing. My guess is this boy has more than two breeds in him. Very nice coat!
I've seen a pup like this when I lived in Maine. I forget her name though? I think it was China?
She was a Lab/Chow/Pit X.
The owners were friend's with the people with her mother.
That part of Maine, not many will Spay/Nueter thier pets.