craftbukkit/nms-patches/net/minecraft/world/entity/animal/sheep/EntitySheep.patch

--- a/net/minecraft/world/entity/animal/sheep/EntitySheep.java
+++ b/net/minecraft/world/entity/animal/sheep/EntitySheep.java
@@ -53,6 +53,11 @@
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.level.storage.loot.LootTables;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.SheepRegrowWoolEvent;
+// CraftBukkit end
+
 public class EntitySheep extends EntityAnimal implements IShearable {
 
     private static final int EAT_ANIMATION_TICKS = 40;
@@ -163,6 +168,11 @@
                 WorldServer worldserver = (WorldServer) world;
 
                 if (this.readyForShearing()) {
+                    // CraftBukkit start
+                    if (!CraftEventFactory.handlePlayerShearEntityEvent(entityhuman, this, itemstack, enumhand)) {
+                        return EnumInteractionResult.PASS;
+                    }
+                    // CraftBukkit end
                     this.shear(worldserver, SoundCategory.PLAYERS, itemstack);
                     this.gameEvent(GameEvent.SHEAR, entityhuman);
                     itemstack.hurtAndBreak(1, entityhuman, getSlotForHand(enumhand));
@@ -181,7 +191,9 @@
         worldserver.playSound((Entity) null, (Entity) this, SoundEffects.SHEEP_SHEAR, soundcategory, 1.0F, 1.0F);
         this.dropFromShearingLootTable(worldserver, LootTables.SHEAR_SHEEP, itemstack, (worldserver1, itemstack1) -> {
             for (int i = 0; i < itemstack1.getCount(); ++i) {
+                this.forceDrops = true; // CraftBukkit
                 EntityItem entityitem = this.spawnAtLocation(worldserver1, itemstack1.copyWithCount(1), 1.0F);
+                this.forceDrops = false; // CraftBukkit
 
                 if (entityitem != null) {
                     entityitem.setDeltaMovement(entityitem.getDeltaMovement().add((double) ((this.random.nextFloat() - this.random.nextFloat()) * 0.1F), (double) (this.random.nextFloat() * 0.05F), (double) ((this.random.nextFloat() - this.random.nextFloat()) * 0.1F)));
@@ -301,6 +313,12 @@
 
     @Override
     public void ate() {
+        // CraftBukkit start
+        SheepRegrowWoolEvent event = new SheepRegrowWoolEvent((org.bukkit.entity.Sheep) this.getBukkitEntity());
+        this.level().getCraftServer().getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) return;
+        // CraftBukkit end
         super.ate();
         this.setSheared(false);
         if (this.isBaby()) {