Here's a random observation that I made today. My 2 dogs do not react nearly as strongly to my Spark as they do to my Mavic. This is true both indoors and outside. I am not sure if it is just because it is smaller or the pitch of the prop sound seems higher. They distinctly are not particularly happy if the Mavic is flying around them but almost seem to ignore the Spark. A benefit to this is that it is a bit easier to get some good pictures of them from the air.