If you are looking to specifically convert (tamed Wolves) into hedgehogs using Optifine, you can customize existing "Better Dogs" or animal-replacement packs by editing their configuration files. Dogs to Hedgehogs (Optifine)

: Includes 8 secret skins accessible by renaming the entity with a name tag, including characters like: Metal Sonic Optifine Customization for Mobs : Navigate to assets > minecraft > optifine

: Open wolf_tame.properties with a text editor like Notepad++ to adjust skin randomizations or specific name-tag triggers. : Changes in-game text for armadillo-related items and

: Changes in-game text for armadillo-related items and renames Armadillo scales to Hedgehog quills .

: For a more functional experience (rather than just a visual replacement), the Hedgehogs in Minecraft mod on CurseForge adds hedgehogs as unique, tameable mobs that harvest berries and drop quills for armor.

: Replaces the Armadillo with a custom hedgehog model.