I tried to enlarge this picture without success. I was so fascinated with this story that I still have this magazine. The dogs on the cover look more like Yellow Labs than all the other pictures posted.
Our next door neighbor has a dog that looks exactly like those on the cover of "Science News". When they first got her, maybe 10 years ago, they proclaimed that she was a Yellow Lab. I said to myself "no way is that dog a YL". The neighbor's dog looks and acts exactly like a dog that is defined in various publications as a "Universal Mutt".
The neighbor's dog can be intimidating, as it is towards my wife (she runs from it), or submissive, as with me when I establish that I am the pack leader. I do believe that they have a wild dog that has adapted to a domestic situation. Wild in the sense that it has reached a genetic common ground between wild/cannot be domesticated (wolf,fox,etc.} and wild /can be domesticated (Carolina Dog or maybe the Dingo).
It is a fascinating subject.