In Japanese folklore, the racoon-dog (tanuki) is said to have a magically expandable scrotum.
Ichiyûsai Kuniyoshi ga (on each design) 一勇斎国芳画
By 1911, purchased by William Sturgis Bigelow (b. 1850–d. 1926), Boston [see note 1]; 1911, gift of Bigelow to the MFA. (Accession Date: January 19, 2005) NOTES:  Much of Bigelow's collection of Asian art was formed during his residence in Japan between 1882 and 1889, although he also made acquisitions in Europe and the United States. Bigelow deposited many of these objects at the MFA in 1890 before donating them to the Museum's collection at later dates.
William Sturgis Bigelow Collection
Japanese, Edo period, about 1843–44 (Tenpô 14–Kôka 1)
Iwakiri 2011, #333; Suzuki 1992, #418; Inagaki and Isao, Kuniyoshi no kyôga (1991), #26
Two horizontal chûban on uncut vertical ôban sheet; 35.5 x 23.9 cm (14 x 9 7/16 in.)
Medium or Technique
Woodblock print (nishiki-e); ink and color on paper