The first couple were taken yesterday with this challenge in mind. And others pulled from the archives.
(I have to help out those who aren't horsepeople with the above picture. The sound is "snorting". When horses see something they are uncertain of, they will snake their neck down at the object and "snort". Sometimes several times! When Cooper did that yesterday, I thought "There's my sound picture!" but knew it wasn't easily identified if you aren't around horses. Thanks for asking & commenting!)