It's a mod that replace your Horse into a lion. It's an XNB file so you need to replace the original horse.xnb file before you do this make sure you make a backup of the original file so we can avoid problem when things turn out really bad it didn't happen to me yet but maybe it will happen to you.
Permissions and credits
Credits and distribution permission
Other user's assetsAll the assets in this file belong to the author, or are from free-to-use modder's resources
Upload permissionYou are not allowed to upload this file to other sites under any circumstances
Modification permissionYou must get permission from me before you are allowed to modify my files to improve it
Conversion permissionYou are not allowed to convert this file to work on other games under any circumstances
Asset use permissionYou must get permission from me before you are allowed to use any of the assets in this file
Asset use permission in mods/files that are being soldYou are not allowed to use assets from this file in any mods/files that are being sold, for money, on Steam Workshop or other platforms
Asset use permission in mods/files that earn donation pointsYou are not allowed to earn Donation Points for your mods if they use my assets
Author notes
This author has not provided any additional notes regarding file permissions
File credits
Credits to: Koruyateka For making a Content Patcher of Lion Mount.
Donation Points system
This mod is not opted-in to receive Donation Points
How to install:
1. Locate the Stardew Valley folder.
2. Go to Stardew Valley folder.
3. Click the Content folder.
4. Go to Animals folder.
5. Replace the original file into the file you downloaded
Make sure the original file and the downloaded file has the same name or else it won't work.