"The physical appearance of the following pets will not manifest as a result of the Hatching Process: Sheep Danger Hound Pioneer Dragon Friendly Dragon Fog Unicorn Shardtail Dragon
These pets were obtained through very exclusive promotions, limited edition offers, or as VIP rewards. We may add more pets to this list in the future."
However, there have been a lot of new pets and changes since 2010. Is there an updated list anywhere? She mentions they may add more to the list in the future which especially perplexes me.