Yerfdog is a floating, inflatable dog that says "Yerf!". He is the mascot of Hamumu. His picture can be found in the top left corner on this wiki.
In Dr. Lunatic and Dr. Lunatic Supreme with Cheese Yerfdog primarily serves as the player's guide in the levels in the Gameplay Tutorial world. He cannot be hit or destroyed except via the use of a Special, and any monsters and projectiles will pass straight through him.
Yerfdog (Supreme Monster Database)Edit
|Dr. Lunatic Monster|
|Scan Text:||This isn't really a monster so much. It's our company mascot! I just made him a monster instead of an item for the added cuteness of seeing him hop up and down. He doesn't actually do anything at all in the game - he's completely nonexistent, except that you can see him. What I use him for is the [sic] provide messages to the player. There's even a special background for text messages that you can use just for him!|
|Miscellaneous Info:||Cannot be hit or destroyed except via Specials. All monsters and shots pass through it with no movement impediment.|