Program: 187700
Project: 187700
Buggy source:
@Override public void onEntityDeath(EntityDeathEvent event){
  if (event.getEntity() instanceof Wolf) {
    for (    Wolves wolf : ConfigBuffer.mWolves.values()) {
      if (wolf.getID() == event.getEntity().getEntityId()) {
        if (MyWolfConfig.MaxLives > 0) {
          wolf.Lives-=1;
          if (wolf.Lives <= 0) {
            for (            ItemStack is : wolf.LargeInventory.getContents()) {
              if (is != null) {
                wolf.Wolf.getWorld().dropItem(wolf.getLocation(),new org.bukkit.inventory.ItemStack(is.id,is.count,(short)is.damage));
              }
            }
            wolf.getOwner().sendMessage(MyWolfUtil.SetColors(MyWolfLanguage.getString("String_Node_Str")).replace("String_Node_Str",wolf.Name));
            ConfigBuffer.mWolves.remove(wolf.getOwner().getName());
            MyWolf.Plugin.SaveWolves(ConfigBuffer.WolvesConfig);
            return;
          }
        }
        wolf.Status=WolfState.Dead;
        wolf.RespawnTime=wolf.Experience.getLevel() * MyWolfConfig.RespawnTimeFactor;
        SendDeathMessage(event);
        break;
      }
    }
  }
 else   if (event.getEntity().getLastDamageCause() instanceof EntityDamageByEntityEvent) {
    if (((EntityDamageByEntityEvent)event.getEntity().getLastDamageCause()).getDamager() instanceof Wolf) {
      EntityDamageByEntityEvent e=(EntityDamageByEntityEvent)event.getEntity().getLastDamageCause();
      for (      Wolves wolf : ConfigBuffer.mWolves.values()) {
        if (wolf.getID() == e.getDamager().getEntityId()) {
          if (MyWolfUtil.getCreatureType(e.getEntity()) != null) {
            wolf.Experience.addEXP(MyWolfUtil.getCreatureType(e.getEntity()));
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
@Override public void onEntityDeath(final EntityDeathEvent event){
  if (event.getEntity() instanceof Wolf) {
    for (    Wolves wolf : ConfigBuffer.mWolves.values()) {
      if (wolf.getID() == event.getEntity().getEntityId()) {
        if (MyWolfConfig.MaxLives > 0) {
          wolf.Lives-=1;
          if (wolf.Lives <= 0) {
            for (            ItemStack is : wolf.LargeInventory.getContents()) {
              if (is != null) {
                wolf.Wolf.getWorld().dropItem(wolf.getLocation(),new org.bukkit.inventory.ItemStack(is.id,is.count,(short)is.damage));
              }
            }
            SendDeathMessage(event);
            wolf.sendMessageToOwner(MyWolfUtil.SetColors(MyWolfLanguage.getString("String_Node_Str")).replace("String_Node_Str",wolf.Name));
            ConfigBuffer.mWolves.remove(wolf.getOwner().getName());
            MyWolf.Plugin.SaveWolves(ConfigBuffer.WolvesConfig);
            return;
          }
        }
        wolf.Status=WolfState.Dead;
        wolf.RespawnTime=wolf.Experience.getLevel() * MyWolfConfig.RespawnTimeFactor;
        SendDeathMessage(event);
        wolf.sendMessageToOwner(MyWolfUtil.SetColors(MyWolfLanguage.getString("String_Node_Str").replace("String_Node_Str",wolf.Name).replace("String_Node_Str","String_Node_Str" + wolf.RespawnTime)));
        break;
      }
    }
  }
 else   if (event.getEntity().getLastDamageCause() instanceof EntityDamageByEntityEvent) {
    if (((EntityDamageByEntityEvent)event.getEntity().getLastDamageCause()).getDamager() instanceof Wolf) {
      EntityDamageByEntityEvent e=(EntityDamageByEntityEvent)event.getEntity().getLastDamageCause();
      for (      Wolves wolf : ConfigBuffer.mWolves.values()) {
        if (wolf.getID() == e.getDamager().getEntityId()) {
          if (MyWolfUtil.getCreatureType(e.getEntity()) != null) {
            wolf.Experience.addEXP(MyWolfUtil.getCreatureType(e.getEntity()));
          }
        }
      }
    }
  }
}