This is a re-made data pack! Original code is from The Pokeball Batapack , with some changes in the code and textures!

IMPORTANT:

-Please download the required resource pack.

-This Datapack DOESN'T work with Respawnable Pets Mod, and should not be used toguether! (It causes dogs to get duped, and your game might even crash because of that).
-Do NOT hold this item in your offhand.

How it works:
To capture a mob, throw the Backpack on the wolf (It's like an eder pearl or snowball). To release it, throw it again :)