This add-on increases the spawn frequency for wolves by making them spawn in all kinds of grass biomes. Previously they could only spawn in taiga and forest biomes but now they will spawn anywhere that there is grass and at least two block spaces above them. It's essentially the same spawn rules as for chickens. Creator: SamDaLlama, Twitter Account Updated: 10 September, 2017 (read changelog)
Activate the pack for a world in-game
You can get a .ZIP file for this addon here.