Netherhound Egg

For approximately a week after its release in June of 2013, it was possible to eggify a Netherhound due to a bug. This was unintended, and has since been patched, so it is no longer possible to obtain Netherhound eggs except by trading or purchasing them from other players.

If it is spawned, the Netherhound will keep its red-colored name, and it can be tamed. If it is renamed, it will lose its red name. If you breed two Netherhounds together, only a standard wolf will be born. If you eggify a Netherhound after spawning it, it will retain its red name. Note that the Netherhound is simply a renamed wolf, and has no properties of the Netherhound other than its name.

Any Netherhound re-eggified after the 1.8 update but before the 1.15 update will include a lore that reads "Spawn Egg: Wolf." This is because of a 1.9 change, and will occur if a 1.8 egg was placed and then eggified in 1.9-1.12. This change was reversed in 1.15, and Netherhounds eggified since 1.15 will have no lore.