A smart dog will develop more intelligence with less human intervention. IOW, it you let a dog be a dog they will learn to think and reason better than if you dominate their time and baby them.
I read an article similar to that thought, tho don't know where it is now, and once I began to think about the article and my Blue, it all made sense. Again...father was a doberman and mother was a weimaraner...his brain took after the doberman side.
I had stepchildren and didn't have the time to fool with and train him like I had my other dogs, but he developed an intelligence superior to any dog I have ever had growing up that way. He learned to think for himself reason what he needed to do for each situation he might be confronted with. You could literally see his brain working in his eyes.
Example; My ex and I received some mallard ducks which we hastily put in a low fence pen with a kids swimming pool with water...husbands idea. One left before we got the second one in.
The next morning, I heard Blue at the door with his, "there's trouble, Mom" high pitched bark. I quickly got dressed and went to the door, asking, "What is it, Blue? He takes off toward the duck pen and I follow...no duck. I look at Blue and ask, "Where's is he?" Blue takes off across the road toward the lake and I run following him and see the neighbor's dog, Argus, just as he was picking up the duck by its breast. I hollar, "Argus, you drop my duck!!!", which he did and everyone lived happily ever after.
Just one of many heroic Blue true stories...