Pigs walk around very slowly, even when you hit them.
Pig move very slow when being attracted
Pigs not fleeing when attacked.
Pigs no longer run away when hit unlike cows, sheeps, chickens, and mooshrooms
Pigs do not run when set on fire
Pigs do not run when hit by a player
Pigs move the same speed as hoglins
Mobs that flee when hit no longer flee after being hit by a player in creative