What type of dog is this?

I have had him forever. The pound we got him from said he was a Golden Retriever Chocolate Lab mix, but his doesn't look like a Labrador Retriever. He is a lot bigger, and not a black or blond color. He is golden. He looks like a Golden Retrieve with short fur, like a retriever and lab mix, but how can he be if he is so much bigger then they are supposed to be?