This is the Dyable Wolves texture pack by Downloadable Duck. It allows you to use dye on tamed wolves, like you can do with the on_tame NBT tag. Except you can actually tame these!
Select version for changelog:
Changelog
-added better pictures
-quacked way too much
-ate some duck food
-asked for more
-Removed MCPEDL download and added MediaFire download so I can trace how many I have