> Oh yes. I heard somewhere that with robots, humans react more and more favorably towards them the closer to human they get in appearance and behavior, but only up to a certain point. After that point, the response is almost revulsion, even when the robot is very human-like. Perhaps the same would be true of dogs or other animals we've turned into almost-human "friends".

This is called "the uncanny valley." The actual evidence for the phenomenon is kind of weak, but it's interesting nonetheless.