So, Dragon City added more Icons to denote sources for Dragons. The new Sources are:
-Reward by winning in PVP Areas or Quests: Includes the 25 Quest Dragons (Pterodactyl, Obscure, etc.) & these five Dragons (most likely from Arenas): Equinox, Chimera, Glowppy, Desmuk, and Holy.
-Obtained in the Shop: The base 11 Dragons for each Element (Terra, Archangel, etc.).
-Opening a Warrior's Chest: Every Dragon that is obtainable as Orbs in the Arena Chests (Boulder, Kitsune, Obsidian, Wisp, etc.).
-Promotion from a PVP Arena: Any Dragon obtained once you go into a new Arena (Bjorn, Katsumoto, etc).
-Breeding in the Breeding Sanctuary: Every Dragon that is available in the Sanctuary at this point (Deep Red, Mirage, Supersonic, Millenium, etc.).
-Breeding in the Ancient World: Every Dragon that is available in the Ancient World at this point (Amber, Flawless, Mermaid, etc.).
-Opening an Alliance's Chest: Every Dragon that is obtainable as Orbs in the Alliance Chests (Hard-Headed, Fuming, Destiny [the renamed Primal], etc.).