Merle is a Custom Marking meant to resemble the Merle coat pattern of real-life dogs.
FunFact: The Blotches marking was originally called Merle. However, Estuko decided to design a marking that looked more like the real-life Merle pattern in dogs, and so created the present day Merle marking and renamed the old marking to Blotches on July 31, 2009.
All examples feature wajas with the marking in FF0000 (pure red). However, this marking can come in any Hex Color as well as rainbow (simply put the word "RAINBOW" in the hex field) and chrome (simply put the word "chrome" in the hex field).