Fixed EntityTame event.

src/main/java/net/minecraft/server/EntityWolf.java

@@ -307,15 +307,12 @@ public class EntityWolf extends EntityAnimal {
                 }
 
                 if (!this.world.isStatic) {
-                    if (this.random.nextInt(3) == 0) {
                     // CraftBukkit start
+                    if (this.random.nextInt(3) == 0) {
                         EntityTameEvent event = CraftEventFactory.callEntityTameEvent(this, entityhuman);
 
-                        if (event.isCancelled()) {
+                        if (!event.isCancelled()) {
-                            return false;
-                        }
                         // CraftBukkit end
-
                             this.d(true);
                             this.a((PathEntity) null);
                             this.setSitting(true);
@@ -328,6 +325,7 @@ public class EntityWolf extends EntityAnimal {
                             this.world.a(this, (byte) 6);
                         }
                     }
+                }
 
                 return true;
             }
@@ -421,6 +419,11 @@ public class EntityWolf extends EntityAnimal {
     }
 
     public void d(boolean flag) {
+        // CraftBukkit start
+       EntityTameEvent event = CraftEventFactory.callEntityTameEvent(this, null);
+
+        if (!event.isCancelled()) {
+        // CraftBukkit end
             byte b0 = this.datawatcher.a(16);
 
             if (flag) {
@@ -430,3 +433,4 @@ public class EntityWolf extends EntityAnimal {
             }
         }
     }
+}

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -238,7 +238,7 @@ public class CraftEventFactory {
      */
     public static EntityTameEvent callEntityTameEvent(EntityLiving entity, EntityHuman tamer) {
         org.bukkit.entity.Entity bukkitEntity = entity.getBukkitEntity();
-        org.bukkit.entity.AnimalTamer bukkitTamer = (AnimalTamer) tamer.getBukkitEntity();
+        org.bukkit.entity.AnimalTamer bukkitTamer = (tamer != null ? (AnimalTamer) tamer.getBukkitEntity() : null);
         CraftServer craftServer = (CraftServer) bukkitEntity.getServer();
 
         EntityTameEvent event = new EntityTameEvent(bukkitEntity, bukkitTamer);