It's required to use with Realistic Breeds Pack the texture to appear correctly. https://ko-fi.com/s/6ba873adf0

The purchased set also includes a model of a regular horse with a tail model from the Person_44 х Naomi set.

  What you'll get with your purchase:

✔️ Ready-to-use resource pack for version 1.20 – simply unzip and place in:config > swem > community packs

✔️ Separate textures – if you want to integrate them into your own project.  

🚫 Prohibited:
Reselling the textures
Claiming the textures as your own
✅ Allowed:
Use in single-player and multiplayer games