I'm more of a proponent of good owners making good dogs, but this is related and interesting.
There have been experiments done with foxes, selectively breeding for "tameness". They took the animals with the shortest flight distance / least amount of fear or aggressive behavior exhibited towards their human captors, and bred those animals together. By the tenth generation, nearly twenty percent of all foxes were friendly and quite tame. From
this article:
"As the experiment continued, something else began to happen. By generations eight and ten, the foxes started developing spots. Some of them were even marked like border collies. Some foxes developed shorter legs and tails than the wild type, while others had tails that curled over their backs. Even more unusually, a few vixens had estrus cycles longer than normal, and a few also had estrus cycles twice a year. All of these traits are traits of domestic animals."
So... tameness is not only something that you can selectively breed for, but also something that is tied genetically to other physical traits. If you can breed for tameness, you can probably breed the other way... no?