Spirit is a golden-coated (specifically, isabella) mustang horse of incredible charm, indomitable, rebellious, wild and courageous. He is the leader of the Cimarron herd, a role in which he succeeded his father. He has never known humans, and the first time he tries to approach them, he is captured by soldiers who forcibly separate him from his family and his land. Traumatised by this unpleasant experience, he tries to have nothing more to do with them until he meets Little River, with whom he befriends and thanks to whom he learns that not all humans are cruel. Spirit willingly allows Little River to ride him only at the end of the film. He falls madly in love with Rain, whom he saves, and at the end of the film he reunites with her, taking her to live in freedom with the rest of his herd.

Tip:

I suggest using a particular enhancement extension:

UDDetailer:
GitHub - wkpark/uddetailer: μ DDetailer, DDetailer fork to support DDetailer as an extension

or

ADetailer:
GitHub - Bing-su/adetailer: Auto detecting, masking and inpainting with detection model.

and I suggest pairing it with the following correction model:
Fdetailer - Adetailer for Furries - v1.1 | Other Detection | Civitai