I suspect that any herd/pack animal necessarily has a large range of social interaction signals to facilitate communication, regardless of whether those are noticeable for most humans (and I've seen the amazing Monty in Martin Clunes Horses series). I'm not altogether convinced though that horses have the same level of behaviour/capabilities developed specifically through interaction with humans which dogs appear to have.
As always I'm not a person who studies this so I'm open to being proven wrong but my viewings/readings so far bring me to the conclusion above ; )


