Hey DSH105,

First off, not sure if this is something you can fix or the dev of worldborders (http://dev.bukkit.org/bukkit-plugins/worldborder/)

One of my staff members has let me know that if you place a pet on your head you're able to bypass the world borders. You're unable to do this whilst riding a pet and could be exploited.

If you're unable to to do it your end ill try to get in contact with the worldborder dev.

Thanks

This is unfortunately a problem in Bukkit and is out of my control to fix. Sorry :(

This is also the same probelm as #51