Defeat entities called wolves, dogs and werewolves, with the soul eater sword and moonlight orb in the off hand to collect their souls and summon the shadow of the hound
Do the same with piglin and the sulfur orb, hoglin, and variant entities to summon the shadowpig.
This mod is compatible with those that bring entities with those names, such as Piglin Boss (AdventureZ) or Werewolf (Werewolves - Become a Beast!)