23w51b has two unused duplicate wolf armor sound events, "entity.wolf.armor_equip" and "entity.wolf.armor_unequip". These are duplicates of "item.armor.equip_wolf" and "item.armor.unequip_wolf". The unused sound events also refer to sounds that do not exist, "mob/wolf/armor_equip1", "mob/wolf/armor_equip2", "mob/wolf/armor_unequip1", and "mob/wolf/armor_unequip2". The unused sound events are not defined in the code, only in sounds.json, so they cannot be played in-game.