[mannykannot]

That is an interesting reversal of the causality, though if selection is involved, there would be a genetic change in either case, so sorting out the cause could be difficult.

Do people see droopy ears as more friendly? I guess it indicates that the animal is not particularly alert, and so unlikely to be on the verge of aggression.

[learnstats2]

Perhaps people today think droopy ears are more friendly just because (for example) the first domesticated animals happened by chance to have droopy ears.