diff --git a/src/main/java/com/minelittlepony/unicopia/ability/magic/spell/DisguiseSpell.java b/src/main/java/com/minelittlepony/unicopia/ability/magic/spell/DisguiseSpell.java
index d0eacf15..5322374d 100644
--- a/src/main/java/com/minelittlepony/unicopia/ability/magic/spell/DisguiseSpell.java
+++ b/src/main/java/com/minelittlepony/unicopia/ability/magic/spell/DisguiseSpell.java
@@ -268,7 +268,7 @@ public class DisguiseSpell extends AbstractSpell implements AttachableSpell, Sup
             entity.tick();
         }
 
-        behaviour.update(source, entity);
+        behaviour.update(source, entity, this);
 
         if (source instanceof Pony) {
             Pony player = (Pony)source;
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ChickenBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ChickenBehaviour.java
index d763eda0..846d2008 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ChickenBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ChickenBehaviour.java
@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
 import net.minecraft.entity.Entity;
@@ -20,7 +21,7 @@ public class ChickenBehaviour extends EntityBehaviour<ChickenEntity> {
     }
 
     @Override
-    public void update(Caster<?> source, ChickenEntity entity) {
+    public void update(Caster<?> source, ChickenEntity entity, Spell spell) {
         entity.eggLayTime = Integer.MAX_VALUE;
 
         if (source instanceof Pony) {
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/CreeperBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/CreeperBehaviour.java
index 9d8f6fe2..99094449 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/CreeperBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/CreeperBehaviour.java
@@ -1,11 +1,13 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
+
 import net.minecraft.entity.mob.CreeperEntity;
 
 public class CreeperBehaviour extends EntityBehaviour<CreeperEntity> {
     @Override
-    public void update(Caster<?> source, CreeperEntity entity) {
+    public void update(Caster<?> source, CreeperEntity entity, Spell spell) {
         if (source.getEntity().isSneaking()) {
             entity.setFuseSpeed(1);
         } else {
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EndermanBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EndermanBehaviour.java
index 6aeac619..22e57c67 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EndermanBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EndermanBehaviour.java
@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 
 import net.minecraft.block.Blocks;
 import net.minecraft.entity.mob.EndermanEntity;
@@ -10,7 +11,7 @@ import net.minecraft.util.Hand;
 
 public class EndermanBehaviour extends EntityBehaviour<EndermanEntity> {
     @Override
-    public void update(Caster<?> source, EndermanEntity entity) {
+    public void update(Caster<?> source, EndermanEntity entity, Spell spell) {
         if (source.getOwner().isSneaking() || source.getOwner().isSprinting()) {
             entity.setTarget(entity);
         } else {
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EntityBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EntityBehaviour.java
index c748904c..6202378b 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EntityBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/EntityBehaviour.java
@@ -5,6 +5,7 @@ import java.util.function.Supplier;
 import javax.annotation.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;
 import com.minelittlepony.unicopia.util.Registries;
 
@@ -24,7 +25,7 @@ public class EntityBehaviour<T extends Entity> {
     private static final EntityBehaviour<Entity> DEFAULT = new EntityBehaviour<>();
     private static final Registry<EntityBehaviour<?>> REGISTRY = Registries.createSimple(new Identifier("unicopia", "entity_behaviour"));
 
-    public void update(Caster<?> source, T entity) {
+    public void update(Caster<?> source, T entity, Spell spell) {
 
     }
 
@@ -175,6 +176,7 @@ public class EntityBehaviour<T extends Entity> {
     }
 
     static {
+        register(SheepBehaviour::new, EntityType.SHEEP);
         register(EndermanBehaviour::new, EntityType.ENDERMAN);
         register(SpellcastingIllagerBehaviour::new, EntityType.ILLUSIONER, EntityType.EVOKER);
         register(ShulkerBehaviour::new, EntityType.SHULKER);
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/MinecartBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/MinecartBehaviour.java
index b308f18c..c6067ce2 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/MinecartBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/MinecartBehaviour.java
@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.sound.MovingMinecartSoundInstance;
@@ -18,7 +19,7 @@ public class MinecartBehaviour extends EntityBehaviour<AbstractMinecartEntity> {
     }
 
     @Override
-    public void update(Caster<?> source, AbstractMinecartEntity entity) {
+    public void update(Caster<?> source, AbstractMinecartEntity entity, Spell spell) {
         entity.yaw -= 90;
         entity.prevYaw -= 90;
 
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SheepBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SheepBehaviour.java
new file mode 100644
index 00000000..e37407c7
--- /dev/null
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SheepBehaviour.java
@@ -0,0 +1,77 @@
+package com.minelittlepony.unicopia.entity.behaviour;
+
+import java.util.Random;
+
+import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
+import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.mixin.MixinSheepEntity;
+import com.minelittlepony.unicopia.util.WorldEvent;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.entity.ItemEntity;
+import net.minecraft.entity.passive.SheepEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.sound.SoundEvents;
+import net.minecraft.util.math.BlockPos;
+
+public class SheepBehaviour extends EntityBehaviour<SheepEntity> {
+    @Override
+    public void update(Caster<?> source, SheepEntity entity, Spell spell) {
+        if (source instanceof Pony) {
+            Pony player = (Pony)source;
+
+            if (player.sneakingChanged()) {
+
+                BlockPos pos = entity.getBlockPos().down();
+                BlockState state = entity.world.getBlockState(pos);
+                boolean grass = state.isOf(Blocks.GRASS_BLOCK);
+
+                if (player.getOwner().isSneaking()) {
+                    if (grass && entity.world.isClient && entity.isSheared()) {
+                        entity.handleStatus((byte)10);
+                    }
+                } else {
+                    if (entity.isSheared() && grass) {
+                        WorldEvent.play(WorldEvent.DESTROY_BLOCK, entity.world, pos, state);
+                        entity.world.setBlockState(pos, Blocks.DIRT.getDefaultState(), 2);
+
+                        entity.onEatingGrass();
+                    } else if (!entity.isSheared()) {
+                        ItemStack dropType = new ItemStack(MixinSheepEntity.getDrops().get(entity.getColor()).asItem());
+
+                        player.getOwner().playSound(SoundEvents.ENTITY_SHEEP_SHEAR, SoundCategory.PLAYERS, 1, 1);
+                        entity.setSheared(true);
+
+                        Random rng = entity.world.random;
+                        PlayerInventory inv = player.getOwner().inventory;
+
+                        int dropAmount = rng.nextInt(3);
+                        int slot;
+
+                        do {
+                            slot = inv.method_7371(dropType);
+                            if (slot < 0) {
+                                break;
+                            }
+                            inv.removeStack(slot, 1);
+                            ItemEntity itemEntity = entity.dropItem(dropType.getItem(), 1);
+                            if (itemEntity != null) {
+                               itemEntity.setVelocity(itemEntity.getVelocity().add(
+                                       (rng.nextFloat() - rng.nextFloat()) * 0.1F,
+                                       rng.nextFloat() * 0.05F,
+                                       (rng.nextFloat() - rng.nextFloat()) * 0.1F
+                               ));
+                               itemEntity.setPickupDelay(40);
+                            }
+                        } while (dropAmount-- > 0);
+                    }
+                    spell.setDirty(true);
+                }
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ShulkerBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ShulkerBehaviour.java
index 8e86731e..1af79c3c 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ShulkerBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/ShulkerBehaviour.java
@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.mixin.MixinShulkerEntity;
 
@@ -15,7 +16,7 @@ import net.minecraft.util.math.Vec3d;
 
 public class ShulkerBehaviour extends EntityBehaviour<ShulkerEntity> {
     @Override
-    public void update(Caster<?> source, ShulkerEntity shulker) {
+    public void update(Caster<?> source, ShulkerEntity shulker, Spell spell) {
         shulker.yaw = 0;
         shulker.prevBodyYaw = 0;
         shulker.bodyYaw = 0;
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SilverfishBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SilverfishBehaviour.java
index a0a147f1..62cf7b40 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SilverfishBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SilverfishBehaviour.java
@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 import com.minelittlepony.unicopia.block.state.StateMaps;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.util.WorldEvent;
@@ -11,7 +12,7 @@ import net.minecraft.util.math.BlockPos;
 
 public class SilverfishBehaviour extends EntityBehaviour<SilverfishEntity> {
     @Override
-    public void update(Caster<?> source, SilverfishEntity entity) {
+    public void update(Caster<?> source, SilverfishEntity entity, Spell spell) {
         if (source instanceof Pony && !source.isClient()) {
             Pony player = (Pony)source;
 
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SpellcastingIllagerBehaviour.java b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SpellcastingIllagerBehaviour.java
index 41f36988..a13579f4 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SpellcastingIllagerBehaviour.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/behaviour/SpellcastingIllagerBehaviour.java
@@ -1,13 +1,14 @@
 package com.minelittlepony.unicopia.entity.behaviour;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
+import com.minelittlepony.unicopia.ability.magic.Spell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
 import net.minecraft.entity.mob.SpellcastingIllagerEntity;
 
 public class SpellcastingIllagerBehaviour extends EntityBehaviour<SpellcastingIllagerEntity> {
     @Override
-    public void update(Caster<?> source, SpellcastingIllagerEntity entity) {
+    public void update(Caster<?> source, SpellcastingIllagerEntity entity, Spell s) {
 
         if (source instanceof Pony) {
             Pony player = (Pony)source;
diff --git a/src/main/java/com/minelittlepony/unicopia/mixin/MixinSheepEntity.java b/src/main/java/com/minelittlepony/unicopia/mixin/MixinSheepEntity.java
new file mode 100644
index 00000000..3d51be76
--- /dev/null
+++ b/src/main/java/com/minelittlepony/unicopia/mixin/MixinSheepEntity.java
@@ -0,0 +1,18 @@
+package com.minelittlepony.unicopia.mixin;
+
+import java.util.Map;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import net.minecraft.entity.passive.SheepEntity;
+import net.minecraft.item.ItemConvertible;
+import net.minecraft.util.DyeColor;
+
+@Mixin(SheepEntity.class)
+public interface MixinSheepEntity {
+    @Accessor("DROPS")
+    static Map<DyeColor, ItemConvertible> getDrops() {
+        return null;
+    }
+}
diff --git a/src/main/java/com/minelittlepony/unicopia/network/EffectSync.java b/src/main/java/com/minelittlepony/unicopia/network/EffectSync.java
index 85e5f60b..a3030ee8 100644
--- a/src/main/java/com/minelittlepony/unicopia/network/EffectSync.java
+++ b/src/main/java/com/minelittlepony/unicopia/network/EffectSync.java
@@ -27,6 +27,9 @@ public class EffectSync {
 
     private final TrackedData<CompoundTag> param;
 
+    @Nullable
+    private CompoundTag lastValue;
+
     public EffectSync(Caster<?> owned, TrackedData<CompoundTag> param) {
         this.owned = owned;
         this.param = param;
@@ -68,14 +71,18 @@ public class EffectSync {
 
     @SuppressWarnings("unchecked")
     public <E extends Spell> E get(Class<E> type, boolean update) {
-        if (!update) {
-            if (effect == null || type == null || type.isAssignableFrom(effect.getClass())) {
-                return (E)effect;
-            }
-
-            return null;
+        if (update) {
+            sync();
         }
 
+        if (effect == null || type == null || type.isAssignableFrom(effect.getClass())) {
+            return (E)effect;
+        }
+
+        return null;
+    }
+
+    private void sync() {
         CompoundTag comp = owned.getEntity().getDataTracker().get(param);
 
         if (comp == null || !comp.contains("effect_id")) {
@@ -83,6 +90,7 @@ public class EffectSync {
                 effect.setDead();
                 effect = null;
             }
+            return;
         } else {
             String id = comp.getString("effect_id");
 
@@ -92,17 +100,14 @@ public class EffectSync {
                 }
                 effect = SpellRegistry.instance().createEffectFromNBT(comp);
             } else if (owned.getEntity().world.isClient()) {
-                effect.fromNBT(comp);
+                if (lastValue != comp || !(comp == null || comp.equals(lastValue))) {
+                    lastValue = comp;
+                    effect.fromNBT(comp);
+                }
             } else if (effect.isDirty()) {
                 set(effect);
             }
         }
-
-        if (effect == null || type == null || type.isAssignableFrom(effect.getClass())) {
-            return (E)effect;
-        }
-
-        return null;
     }
 
     public void set(@Nullable Spell effect) {
diff --git a/src/main/resources/unicopia.mixin.json b/src/main/resources/unicopia.mixin.json
index ec20a04d..d8ff26c9 100644
--- a/src/main/resources/unicopia.mixin.json
+++ b/src/main/resources/unicopia.mixin.json
@@ -13,6 +13,7 @@
     "MixinPlayerEntity",
     "MixinProjectileEntity",
     "MixinServerPlayerEntity",
+    "MixinSheepEntity",
     "MixinShulkerEntity",
     "MixinTargetPredicate"
   ],