"Mud dog" is the general name of mud toys sold at the "Ancestors' Meeting" of Taihao Mausoleum in Huaiyang. Overlapping two clay characters, the first is an attribute, which is used as a verb, that is, hand-delivered and also means kissing; The last word "mud" is a noun, that is, the substance of the object "mud". Of course, this explanation is still limited to the conceptual understanding as the name suggests.