That would work out if mostly the breeds that fulfill the babysheme would have no mask but most working breeds don´t have any eather.
There has an interesting research been done some time ago. Because the flight reaction of the foxes is a big problem in fur-production a scientist selected foxes only on one feature, tameness in the meaning of low flight-reaction. Within very few generations he got very tame foxes, with black and white spots and floppy ears. The theory on the domestication of dogs is that the wolfs with low flight-reaction did have an evolutionary advantage, they got more food on the dumps near human settlings and that the different looks came accidentially with that.
Ina
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