Blue Dog
The Blue Dog is a limited uncommon pet in Adopt Me! that was available for a period of time. It was one of the very first pets to be added to the game, along with the Pink Cat. It can only be hatched out of the Blue Egg, which was obtainable during the Pets update. It is no longer available and can only be obtained through trading with other players who have the Blue Dog or by hatching one from a Blue Egg, if they happen to still have one.