Program: 45001
Project: 45001
Buggy source:
@Override public void onPlayerInteractEntity(PlayerInteractEntityEvent event){
  if (!event.isCancelled()) {
    Player player=event.getPlayer();
    Entity entity=event.getRightClicked();
    World world=entity.getWorld();
    WorldConfig worldConfig=configManager.getWorldConfig(world);
    if (entity instanceof Wolf) {
      Wolf wolf=(Wolf)entity;
      if (wolf.isTamed() && wolf.getOwner().equals(player)) {
        com.halvors.wolf.wolf.Wolf wolf1=wolfManager.getWolf(wolf);
        Material item=player.getItemInHand().getType();
        if (item.equals(Material.BONE)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            selectedWolfManager.addSelectedWolf(player.getName(),wolf);
            player.sendMessage(ChatColor.GREEN + "String_Node_Str");
          }
        }
 else         if (item.equals(Material.PAPER)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            int health=wolf.getHealth();
            int maxHealth=20;
            player.sendMessage("String_Node_Str" + ChatColor.YELLOW + wolf1.getName());
            player.sendMessage("String_Node_Str" + ChatColor.YELLOW + Integer.toString(health)+ "String_Node_Str"+ Integer.toString(maxHealth));
          }
        }
 else         if (item.equals(Material.CHEST)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            if (worldConfig.wolfInventory) {
              if (wolf1.hasInventory()) {
                EntityPlayer entityPlayer=((CraftPlayer)player).getHandle();
                entityPlayer.a(wolf1.getInventory());
              }
 else {
                wolf1.addInventory();
                player.getItemInHand().setAmount(player.getItemInHand().getAmount() - 1);
                player.sendMessage(ChatColor.YELLOW + wolf1.getName() + ChatColor.WHITE+ "String_Node_Str");
              }
            }
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
@Override public void onPlayerInteractEntity(PlayerInteractEntityEvent event){
  if (!event.isCancelled()) {
    Player player=event.getPlayer();
    Entity entity=event.getRightClicked();
    World world=entity.getWorld();
    WorldConfig worldConfig=configManager.getWorldConfig(world);
    if (entity instanceof Wolf) {
      Wolf wolf=(Wolf)entity;
      if (wolf.isTamed() && wolf.getOwner().equals(player)) {
        if (!wolfManager.hasWolf(wolf.getUniqueId())) {
          wolfManager.addWolf(wolf);
          com.halvors.wolf.wolf.Wolf wolf1=wolfManager.getWolf(wolf);
          player.sendMessage("String_Node_Str" + ChatColor.YELLOW + wolf1.getName());
          player.sendMessage("String_Node_Str");
        }
        com.halvors.wolf.wolf.Wolf wolf1=wolfManager.getWolf(wolf);
        Material item=player.getItemInHand().getType();
        if (item.equals(Material.BONE)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            selectedWolfManager.addSelectedWolf(player.getName(),wolf);
            player.sendMessage(ChatColor.GREEN + "String_Node_Str");
          }
        }
 else         if (item.equals(Material.PAPER)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            int health=wolf.getHealth();
            int maxHealth=20;
            player.sendMessage("String_Node_Str" + ChatColor.YELLOW + wolf1.getName());
            player.sendMessage("String_Node_Str" + ChatColor.YELLOW + Integer.toString(health)+ "String_Node_Str"+ Integer.toString(maxHealth));
          }
        }
 else         if (item.equals(Material.CHEST)) {
          if (plugin.hasPermissions(player,"String_Node_Str")) {
            if (worldConfig.wolfInventory) {
              if (wolf1.hasInventory()) {
                EntityPlayer entityPlayer=((CraftPlayer)player).getHandle();
                entityPlayer.a(wolf1.getInventory());
              }
 else {
                wolf1.addInventory();
                player.getItemInHand().setAmount(player.getItemInHand().getAmount() - 1);
                player.sendMessage(ChatColor.YELLOW + wolf1.getName() + ChatColor.WHITE+ "String_Node_Str");
              }
            }
          }
        }
      }
    }
  }
}