A mod that fixes Minecraft's huge issue of not being able to pet animals. It allows you to pet most passive mobs, as well as some others.
How to pet: Simply sneak and right-click a mob to pet it. Petting your own tamed mob, such as a wolf, cat, or parrot, heals both you and the mob.
All vanilla pettable mobs:
Modpack usage: Feel free, no need to ask.