whinnies
Soft equine cries
Whinnies are the gentle, high-pitched sounds horses make—softer and more conversational than a full neigh.
A horse whinnies in greeting or anticipation: The mare whinnied when she heard the feed bucket.
The verb follows: a horse whinnies, whinnied, is whinnying.
Figuratively, to whinny is to speak in a thin, wavering voice.