Authentic Edo period original, 1831, Japanese woodblock print by Sadatora Utagawa (active from 1820-1844).  From his shunga series, Kai chu so shi.  Woodblock print picture measures 22 cm x 15.2 cm.  Very good colors and impressions.  Condition is good with some wear and soiling.  No backing.  Please see and judge from photos.
 
An old woodblock print picture by one of the more obscure artists of the Utagawa School.  In this winter scene, two small dogs lounge in the comforts of a giant log covered in snow.