Puk, from British or Scandanavian mythology, keeping a pile of treasure. © Donna Quinn.
Puk is a dragon of Germanic folklore, appearing in the legends of Estonia, Lithuania, Latvia, and Germany. 
A Puk is considered a domestic or household dragon  that protects domestic animals.  Puks are generally not malevolent in nature; the house in which they dwell becomes their home.  They answer to the owner of the house as a master.  A family with a Puk living in its home has many benefits, for a Puk brings good fortune.  However, the benefit of Puks stop with their owners, for they are tricksters by nature and will steal treasure for hoarding at the detriment of neighbors. 
A Dragon of Many Names
The name Puk is likely of German origin (i.e. Puck).  Regional names for the creature include the following:
- Slavic - Krukis 
- Germany - Puk, Puks, Puck 
- Latvia - Pukis 
- Lithuania - Pukys, Kaukas,  Kaukas 
- Estonia - Pukje, Pisuhand, Tulihand, Puuk 
Puk is a serpentine-bodied, four-footed dragon approximately two feet (61 cm) in length, sometimes described as having wings.  Puk flies through the sky as a dragon with a fiery tail.  It is also described as a sneaky, hoarding dragon. 
For more information on footnotes and references, please see the bibliography.