--- a/net/minecraft/world/entity/Leashable.java
+++ b/net/minecraft/world/entity/Leashable.java
@@ -7,15 +7,23 @@
 import net.minecraft.core.BlockPos;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.NbtUtils;
+import net.minecraft.nbt.Tag;
 import net.minecraft.network.protocol.game.ClientboundSetEntityLinkPacket;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.entity.decoration.LeashFenceKnotEntity;
 import net.minecraft.world.item.Items;
+import net.minecraft.world.level.ItemLike;
+import net.minecraft.world.level.Level;
+// CraftBukkit start
+import org.bukkit.event.entity.EntityUnleashEvent;
+import org.bukkit.event.entity.EntityUnleashEvent.UnleashReason;
+// CraftBukkit end
 
 public interface Leashable {
+
     String LEASH_TAG = "leash";
-    double LEASH_TOO_FAR_DIST = 10.0;
-    double LEASH_ELASTIC_DIST = 6.0;
+    double LEASH_TOO_FAR_DIST = 10.0D;
+    double LEASH_ELASTIC_DIST = 6.0D;
 
     @Nullable
     Leashable.LeashData getLeashData();
@@ -40,7 +48,7 @@
 
     default void setDelayedLeashHolderId(int unresolvedLeashHolderId) {
         this.setLeashData(new Leashable.LeashData(unresolvedLeashHolderId));
-        dropLeash((Entity)this, false, false);
+        Leashable.dropLeash((Entity & Leashable) this, false, false); // CraftBukkit - decompile error
     }
 
     @Nullable
@@ -49,7 +57,8 @@
             return new Leashable.LeashData(Either.left(nbt.getCompound("leash").getUUID("UUID")));
         } else {
             if (nbt.contains("leash", 11)) {
-                Either<UUID, BlockPos> either = NbtUtils.readBlockPos(nbt, "leash").map(Either::right).orElse(null);
+                Either<UUID, BlockPos> either = (Either) NbtUtils.readBlockPos(nbt, "leash").map(Either::right).orElse(null); // CraftBukkit - decompile error
+
                 if (either != null) {
                     return new Leashable.LeashData(either);
                 }
@@ -62,89 +71,127 @@
     default void writeLeashData(CompoundTag nbt, @Nullable Leashable.LeashData leashData) {
         if (leashData != null) {
             Either<UUID, BlockPos> either = leashData.delayedLeashInfo;
-            if (leashData.leashHolder instanceof LeashFenceKnotEntity leashFenceKnotEntity) {
-                either = Either.right(leashFenceKnotEntity.getPos());
+            Entity entity = leashData.leashHolder;
+            // CraftBukkit start - SPIGOT-7487: Don't save (and possible drop) leash, when the holder was removed by a plugin
+            if (entity != null && entity.pluginRemoved) {
+                return;
+            }
+            // CraftBukkit end
+
+            if (entity instanceof LeashFenceKnotEntity) {
+                LeashFenceKnotEntity entityleash = (LeashFenceKnotEntity) entity;
+
+                either = Either.right(entityleash.getPos());
             } else if (leashData.leashHolder != null) {
                 either = Either.left(leashData.leashHolder.getUUID());
             }
 
             if (either != null) {
-                nbt.put("leash", either.map(uuid -> {
-                    CompoundTag compoundTag = new CompoundTag();
-                    compoundTag.putUUID("UUID", uuid);
-                    return compoundTag;
+                nbt.put("leash", (Tag) either.map((uuid) -> {
+                    CompoundTag nbttagcompound1 = new CompoundTag();
+
+                    nbttagcompound1.putUUID("UUID", uuid);
+                    return nbttagcompound1;
                 }, NbtUtils::writeBlockPos));
             }
         }
     }
 
     private static <E extends Entity & Leashable> void restoreLeashFromSave(E entity, Leashable.LeashData leashData) {
-        if (leashData.delayedLeashInfo != null && entity.level() instanceof ServerLevel serverLevel) {
-            Optional<UUID> optional = leashData.delayedLeashInfo.left();
-            Optional<BlockPos> optional2 = leashData.delayedLeashInfo.right();
-            if (optional.isPresent()) {
-                Entity entity2 = serverLevel.getEntity(optional.get());
-                if (entity2 != null) {
-                    setLeashedTo(entity, entity2, true);
+        if (leashData.delayedLeashInfo != null) {
+            Level world = entity.level();
+
+            if (world instanceof ServerLevel) {
+                ServerLevel worldserver = (ServerLevel) world;
+                Optional<UUID> optional = leashData.delayedLeashInfo.left();
+                Optional<BlockPos> optional1 = leashData.delayedLeashInfo.right();
+
+                if (optional.isPresent()) {
+                    Entity entity1 = worldserver.getEntity((UUID) optional.get());
+
+                    if (entity1 != null) {
+                        Leashable.setLeashedTo(entity, entity1, true);
+                        return;
+                    }
+                } else if (optional1.isPresent()) {
+                    Leashable.setLeashedTo(entity, LeashFenceKnotEntity.getOrCreateKnot(worldserver, (BlockPos) optional1.get()), true);
                     return;
                 }
-            } else if (optional2.isPresent()) {
-                setLeashedTo(entity, LeashFenceKnotEntity.getOrCreateKnot(serverLevel, optional2.get()), true);
-                return;
-            }
 
-            if (entity.tickCount > 100) {
-                entity.spawnAtLocation(Items.LEAD);
-                entity.setLeashData(null);
+                if (entity.tickCount > 100) {
+                    entity.forceDrops = true; // CraftBukkit
+                    entity.spawnAtLocation((ItemLike) Items.LEAD);
+                    entity.forceDrops = false; // CraftBukkit
+                    ((Leashable) entity).setLeashData((Leashable.LeashData) null);
+                }
             }
         }
+
     }
 
     default void dropLeash(boolean sendPacket, boolean dropItem) {
-        dropLeash((Entity)this, sendPacket, dropItem);
+        Leashable.dropLeash((Entity & Leashable) this, sendPacket, dropItem); // CraftBukkit - decompile error
     }
 
     private static <E extends Entity & Leashable> void dropLeash(E entity, boolean sendPacket, boolean dropItem) {
-        Leashable.LeashData leashData = entity.getLeashData();
-        if (leashData != null && leashData.leashHolder != null) {
-            entity.setLeashData(null);
+        Leashable.LeashData leashable_a = ((Leashable) entity).getLeashData();
+
+        if (leashable_a != null && leashable_a.leashHolder != null) {
+            ((Leashable) entity).setLeashData((Leashable.LeashData) null);
             if (!entity.level().isClientSide && dropItem) {
-                entity.spawnAtLocation(Items.LEAD);
+                entity.forceDrops = true; // CraftBukkit
+                entity.spawnAtLocation((ItemLike) Items.LEAD);
+                entity.forceDrops = false; // CraftBukkit
             }
 
-            if (sendPacket && entity.level() instanceof ServerLevel serverLevel) {
-                serverLevel.getChunkSource().broadcast(entity, new ClientboundSetEntityLinkPacket(entity, null));
+            if (sendPacket) {
+                Level world = entity.level();
+
+                if (world instanceof ServerLevel) {
+                    ServerLevel worldserver = (ServerLevel) world;
+
+                    worldserver.getChunkSource().broadcast(entity, new ClientboundSetEntityLinkPacket(entity, (Entity) null));
+                }
             }
         }
+
     }
 
     static <E extends Entity & Leashable> void tickLeash(E entity) {
-        Leashable.LeashData leashData = entity.getLeashData();
-        if (leashData != null && leashData.delayedLeashInfo != null) {
-            restoreLeashFromSave(entity, leashData);
+        Leashable.LeashData leashable_a = ((Leashable) entity).getLeashData();
+
+        if (leashable_a != null && leashable_a.delayedLeashInfo != null) {
+            Leashable.restoreLeashFromSave(entity, leashable_a);
         }
 
-        if (leashData != null && leashData.leashHolder != null) {
-            if (!entity.isAlive() || !leashData.leashHolder.isAlive()) {
-                dropLeash(entity, true, true);
+        if (leashable_a != null && leashable_a.leashHolder != null) {
+            if (!entity.isAlive() || !leashable_a.leashHolder.isAlive()) {
+                // Paper start - Expand EntityUnleashEvent
+                final EntityUnleashEvent event = new EntityUnleashEvent(entity.getBukkitEntity(), (!entity.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE, !entity.pluginRemoved);
+                event.callEvent();
+                Leashable.dropLeash(entity, true, event.isDropLeash()); // CraftBukkit - SPIGOT-7487: Don't drop leash, when the holder was removed by a plugin
+                // Paper end - Expand EntityUnleashEvent
             }
 
-            Entity entity2 = entity.getLeashHolder();
-            if (entity2 != null && entity2.level() == entity.level()) {
-                float f = entity.distanceTo(entity2);
-                if (!entity.handleLeashAtDistance(entity2, f)) {
+            Entity entity1 = ((Leashable) entity).getLeashHolder();
+
+            if (entity1 != null && entity1.level() == entity.level()) {
+                float f = entity.distanceTo(entity1);
+
+                if (!((Leashable) entity).handleLeashAtDistance(entity1, f)) {
                     return;
                 }
 
-                if ((double)f > 10.0) {
-                    entity.leashTooFarBehaviour();
-                } else if ((double)f > 6.0) {
-                    entity.elasticRangeLeashBehaviour(entity2, f);
+                if ((double) f > entity.level().paperConfig().misc.maxLeashDistance) { // Paper - Configurable max leash distance
+                    ((Leashable) entity).leashTooFarBehaviour();
+                } else if ((double) f > 6.0D) {
+                    ((Leashable) entity).elasticRangeLeashBehaviour(entity1, f);
                     entity.checkSlowFallDistance();
                 } else {
-                    entity.closeRangeLeashBehaviour(entity2);
+                    ((Leashable) entity).closeRangeLeashBehaviour(entity1);
                 }
             }
+
         }
     }
 
@@ -153,68 +200,89 @@
     }
 
     default void leashTooFarBehaviour() {
-        this.dropLeash(true, true);
+        // CraftBukkit start
+        boolean dropLeash = true; // Paper
+        if (this instanceof Entity entity) {
+            // Paper start - Expand EntityUnleashEvent
+            final EntityUnleashEvent event = new EntityUnleashEvent(entity.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+            dropLeash = event.isDropLeash();
+            event.callEvent();
+            // Paper end - Expand EntityUnleashEvent
+        }
+        // CraftBukkit end
+        this.dropLeash(true, dropLeash); // Paper
     }
 
-    default void closeRangeLeashBehaviour(Entity entity) {
-    }
+    default void closeRangeLeashBehaviour(Entity entity) {}
 
     default void elasticRangeLeashBehaviour(Entity leashHolder, float distance) {
-        legacyElasticRangeLeashBehaviour((Entity)this, leashHolder, distance);
+        Leashable.legacyElasticRangeLeashBehaviour((Entity & Leashable) this, leashHolder, distance); // CraftBukkit - decompile error
     }
 
     private static <E extends Entity & Leashable> void legacyElasticRangeLeashBehaviour(E entity, Entity leashHolder, float distance) {
-        double d = (leashHolder.getX() - entity.getX()) / (double)distance;
-        double e = (leashHolder.getY() - entity.getY()) / (double)distance;
-        double f = (leashHolder.getZ() - entity.getZ()) / (double)distance;
-        entity.setDeltaMovement(entity.getDeltaMovement().add(Math.copySign(d * d * 0.4, d), Math.copySign(e * e * 0.4, e), Math.copySign(f * f * 0.4, f)));
+        double d0 = (leashHolder.getX() - entity.getX()) / (double) distance;
+        double d1 = (leashHolder.getY() - entity.getY()) / (double) distance;
+        double d2 = (leashHolder.getZ() - entity.getZ()) / (double) distance;
+
+        entity.setDeltaMovement(entity.getDeltaMovement().add(Math.copySign(d0 * d0 * 0.4D, d0), Math.copySign(d1 * d1 * 0.4D, d1), Math.copySign(d2 * d2 * 0.4D, d2)));
     }
 
     default void setLeashedTo(Entity leashHolder, boolean sendPacket) {
-        setLeashedTo((Entity)this, leashHolder, sendPacket);
+        Leashable.setLeashedTo((Entity & Leashable) this, leashHolder, sendPacket); // CraftBukkit - decompile error
     }
 
     private static <E extends Entity & Leashable> void setLeashedTo(E entity, Entity leashHolder, boolean sendPacket) {
-        Leashable.LeashData leashData = entity.getLeashData();
-        if (leashData == null) {
-            leashData = new Leashable.LeashData(leashHolder);
-            entity.setLeashData(leashData);
+        Leashable.LeashData leashable_a = ((Leashable) entity).getLeashData();
+
+        if (leashable_a == null) {
+            leashable_a = new Leashable.LeashData(leashHolder);
+            ((Leashable) entity).setLeashData(leashable_a);
         } else {
-            leashData.setLeashHolder(leashHolder);
+            leashable_a.setLeashHolder(leashHolder);
         }
 
-        if (sendPacket && entity.level() instanceof ServerLevel serverLevel) {
-            serverLevel.getChunkSource().broadcast(entity, new ClientboundSetEntityLinkPacket(entity, leashHolder));
+        if (sendPacket) {
+            Level world = entity.level();
+
+            if (world instanceof ServerLevel) {
+                ServerLevel worldserver = (ServerLevel) world;
+
+                worldserver.getChunkSource().broadcast(entity, new ClientboundSetEntityLinkPacket(entity, leashHolder));
+            }
         }
 
         if (entity.isPassenger()) {
             entity.stopRiding();
         }
+
     }
 
     @Nullable
     default Entity getLeashHolder() {
-        return getLeashHolder((Entity)this);
+        return Leashable.getLeashHolder((Entity & Leashable) this); // CraftBukkit - decompile error
     }
 
     @Nullable
     private static <E extends Entity & Leashable> Entity getLeashHolder(E entity) {
-        Leashable.LeashData leashData = entity.getLeashData();
-        if (leashData == null) {
+        Leashable.LeashData leashable_a = ((Leashable) entity).getLeashData();
+
+        if (leashable_a == null) {
             return null;
         } else {
-            if (leashData.delayedLeashHolderId != 0 && entity.level().isClientSide) {
-                Entity var3 = entity.level().getEntity(leashData.delayedLeashHolderId);
-                if (var3 instanceof Entity) {
-                    leashData.setLeashHolder(var3);
+            if (leashable_a.delayedLeashHolderId != 0 && entity.level().isClientSide) {
+                Entity entity1 = entity.level().getEntity(leashable_a.delayedLeashHolderId);
+
+                if (entity1 instanceof Entity) {
+                    leashable_a.setLeashHolder(entity1);
                 }
             }
 
-            return leashData.leashHolder;
+            return leashable_a.leashHolder;
         }
     }
 
     public static final class LeashData {
+
         int delayedLeashHolderId;
         @Nullable
         public Entity leashHolder;
