confidence, depending on the tone of the neigh and the body language that goes
When one horse neighs in a group turned out together, he is warning the group that he sees something unusual.
There's a relaxation sigh that you watch and listen for when longeing to make sure he's calm before you get on. He will usually put his head down and exhale a deep, sort of fluttering, breath through his nostrils.
Watch Your Horse's Ears When You Ride
Here's what they tell you about what your horse is thinking.
By keeping an eye on your horse's ears the next time you ride, you'll recognize just how well your mount is "hearing" what you have to say.
A horse that is listening to its rider carries his ears in neutral, about in the middle and relaxed.
When a horse pins his ears while being ridden, he has heard perfectly well what you have said, but he is going to ignore you.
Sometimes the straining, forward-pricked ear positions means the horse is also going to disobey.