Netherwhelp's Collar



Netherwhelp's Collar summons and dismisses Netherwhelp, a dragon whelpling companion. The Netherwhelp is the juvenile stage of a Nether drake.

Source
This item is available only to people who bought the Collector's Edition of the Burning Crusade expansion pack.

Unlike the pets from the Collector's Edition of World of Warcraft, the Netherwhelp's Collar item is attached and sent to all your characters, present and future, in the mail as soon as you upgrade your account. Blizzard had originally announced that once you upgrade your game, you cannot re-upgrade it with a Collector's Edition at a later time. This means that the characters associated with your regularly upgraded account could never obtain this item, with a transfer of a character to a Collector's Edition account not allowed. 

However due to numerous requests, Blizzard officially announced on January 22, 2007 that they are working on a solution to help customers re-upgrade their accounts. Those who fall in this category are asked to contact their Billing and Account Services department. Those who posted in the thread at the WoW forum have mentioned their having been able to get their accounts manually re-upgraded using this method.