Add API to access wolf armor

src/main/java/org/bukkit/entity/Wolf.java

@@ -4,12 +4,15 @@ import org.bukkit.DyeColor;
 import org.bukkit.Keyed;
 import org.bukkit.NamespacedKey;
 import org.bukkit.Registry;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.WolfInventory;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * Represents a Wolf
  */
-public interface Wolf extends Tameable, Sittable {
+public interface Wolf extends Tameable, Sittable, InventoryHolder {
 
     /**
      * Checks if this wolf is angry
@@ -86,6 +89,10 @@ public interface Wolf extends Tameable, Sittable {
      */
     void setVariant(@NotNull Variant variant);
 
+    @NotNull
+    @Override
+    WolfInventory getInventory();
+
     /**
      * Represents the variant of a wolf.
      */

src/main/java/org/bukkit/inventory/BodyArmorInventory.java

@@ -0,0 +1,25 @@
+package org.bukkit.inventory;
+
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * An interface to the inventory of an entity capable of holding body armor (wolves, horses, etc.).
+ */
+public interface BodyArmorInventory extends Inventory {
+
+    /**
+     * Gets the item in the entity's body armor slot.
+     *
+     * @return the armor item
+     */
+    @Nullable
+    ItemStack getArmor();
+
+    /**
+     * Sets the item in the entity's body armor slot.
+     *
+     * @param stack the new item
+     */
+    void setArmor(@Nullable ItemStack stack);
+
+}

src/main/java/org/bukkit/inventory/HorseInventory.java

@@ -1,24 +1,7 @@
 package org.bukkit.inventory;
 
-import org.jetbrains.annotations.Nullable;
-
 /**
  * An interface to the inventory of a Horse.
  */
-public interface HorseInventory extends AbstractHorseInventory {
-
-    /**
-     * Gets the item in the horse's armor slot.
-     *
-     * @return the armor item
-     */
-    @Nullable
-    ItemStack getArmor();
-
-    /**
-     * Sets the item in the horse's armor slot.
-     *
-     * @param stack the new item
-     */
-    void setArmor(@Nullable ItemStack stack);
+public interface HorseInventory extends AbstractHorseInventory, BodyArmorInventory {
 }

src/main/java/org/bukkit/inventory/WolfInventory.java

@@ -0,0 +1,7 @@
+package org.bukkit.inventory;
+
+/**
+ * An interface to the inventory of a Wolf.
+ */
+public interface WolfInventory extends BodyArmorInventory {
+}