Select instead for olfactory, and you get a dog that looks like a scent hound.
The Legendary Fox Farm Experiment
Some biologists in Russia decided to do an experiment with silver foxes.
In about twenty generations they ended up with a friendly, docile population of foxes that were piebald (spotted), some with floppy ears, curly tails and shorter legs.
This doesn't mean foxes are the ancestors of some dogs. All modern dogs come from an extinct wolf. It means that in the canine family, tameness is related to many morphological traits. Choose one, and the others come along for the ride.
Click here to read more about the fox farm experiment.