--- a/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -21,21 +21,47 @@
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.phys.AABB;
+// CraftBukkit start
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.block.BlockDispenseEvent;
+// CraftBukkit end
 
 public class ShearsDispenseItemBehavior extends OptionalDispenseItemBehavior {
 
     public ShearsDispenseItemBehavior() {}
 
     @Override
-    @Override
-    protected ItemStack execute(BlockSource blocksource, ItemStack itemstack) {
-        ServerLevel serverlevel = blocksource.level();
+    protected ItemStack execute(SourceBlock sourceblock, ItemStack itemstack) {
+        ServerLevel worldserver = sourceblock.level();
+        // CraftBukkit start
+        org.bukkit.block.Block bukkitBlock = CraftBlock.at(worldserver, sourceblock.pos());
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack);
 
         if (!serverlevel.isClientSide()) {
             BlockPos blockpos = blocksource.pos().relative((Direction) blocksource.state().getValue(DispenserBlock.FACING));
 
-            this.setSuccess(tryShearBeehive(serverlevel, blockpos) || tryShearLivingEntity(serverlevel, blockpos));
-            if (this.isSuccess() && itemstack.hurt(1, serverlevel.getRandom(), (ServerPlayer) null)) {
+        if (event.isCancelled()) {
+            return itemstack;
+        }
+
+        if (!event.getItem().equals(craftItem)) {
+            // Chain to handler for new item
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
+            DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+            if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
+                idispensebehavior.dispense(sourceblock, eventStack);
+                return itemstack;
+            }
+        }
+        // CraftBukkit end
+
+        if (!worldserver.isClientSide()) {
+            BlockPos blockposition = sourceblock.pos().relative((Direction) sourceblock.state().getValue(DispenserBlock.FACING));
+
+            this.setSuccess(tryShearBeehive(worldserver, blockposition) || tryShearLivingEntity(worldserver, blockposition, bukkitBlock, craftItem)); // CraftBukkit
+            if (this.isSuccess() && itemstack.hurt(1, worldserver.getRandom(), (ServerPlayer) null)) {
                 itemstack.setCount(0);
             }
         }
@@ -63,8 +91,8 @@
         return false;
     }
 
-    private static boolean tryShearLivingEntity(ServerLevel serverlevel, BlockPos blockpos) {
-        List<LivingEntity> list = serverlevel.getEntitiesOfClass(LivingEntity.class, new AABB(blockpos), EntitySelector.NO_SPECTATORS);
+    private static boolean tryShearLivingEntity(ServerLevel worldserver, BlockPos blockposition, org.bukkit.block.Block bukkitBlock, CraftItemStack craftItem) { // CraftBukkit - add args
+        List<LivingEntity> list = worldserver.getEntitiesOfClass(LivingEntity.class, new AABB(blockposition), EntitySelector.NO_SPECTATORS);
         Iterator iterator = list.iterator();
 
         while (iterator.hasNext()) {
@@ -73,9 +101,14 @@
             if (livingentity instanceof Shearable) {
                 Shearable shearable = (Shearable) livingentity;
 
-                if (shearable.readyForShearing()) {
-                    shearable.shear(SoundSource.BLOCKS);
-                    serverlevel.gameEvent((Entity) null, GameEvent.SHEAR, blockpos);
+                if (ishearable.readyForShearing()) {
+                    // CraftBukkit start
+                    if (CraftEventFactory.callBlockShearEntityEvent(entityliving, bukkitBlock, craftItem).isCancelled()) {
+                        continue;
+                    }
+                    // CraftBukkit end
+                    ishearable.shear(SoundSource.BLOCKS);
+                    worldserver.gameEvent((Entity) null, GameEvent.SHEAR, blockposition);
                     return true;
                 }
             }