Your riding and pushing your horse a little and a huge "snort" comes out. You think Whoooo this horse is getting upset. Maybe its riding or maybe its pushing flys away. None of that is true! Research from the University of Rennes in France seems to indicate that snorting is a sound when horses like what is going on around them.
What makes them Snort?
1. Socializing with people and other horses.
2. Ability to graze pastures.
3. Big open spaces.
Those were not the only signs. Ears pointed forward or to the side meant happy while those pointed to the back were discomfort.
Because horses are emotional by nature they work on friend and threat based on those emotional systems. If they saw an angry picture of someone they may treat that person more as a threat when they met them in real life.