you could do what CorporalKeith said, or replace the mob texture in the 'entity' folder, which is located inside of the 'textures' folder.



assets > minecraft > textures > entity > <selected mob> > cut & paste the mob skin inside of that folder > rename it the exact name of the name of the mob skin > it should pop up a screen saying something like 'you already have a file with that name' & give you 3 options if i remember correctly.. > select 'replace file'


there, it may be long, but hey.. it works... does it?

While downloading the Mob Skin, there should be a bar at the bottom of the screen. When it finishes, click the up arrow next to the download and select "Open." Then right click the area shown in the second image and select "Copy address." In Minecraft, click on Options... → Resource Packs... → Open Resource Pack Folder. When the window pops up, right click the large empty area (if it is empty) and select "Paste," then close the window. You may need to exit the Resource Packs area and then return before you see it as an option, or maybe even restart Minecraft. I hope this helps!





The download bar





The area to copy





The area to paste (not empty)