Here's why:
* Vernacular usually refers to the language or dialect spoken by ordinary people in a particular region or country. It's not commonly used to describe specific aspects of animal communication.
* Equine refers to horses and related species.
Therefore, "equine vernacular" doesn't have a clear meaning in this context.
Perhaps you were thinking of:
* Equine communication: This refers to the various ways horses communicate with each other and with humans, including body language, vocalizations, and scent.
* Horse terminology: This encompasses the vocabulary used to describe different horse breeds, body parts, equipment, and activities.
If you can provide more context, I might be able to help you understand what you're looking for.