From The Collaborative International Dictionary of English v.0.48:
Scut \Scut\, n. [Cf. Icel. skott a fox's tail. [root] 159.]
[Obs.]
The tail of a hare, or of a deer, or other animal whose tail
is short, esp. when carried erect; hence, sometimes, the
animal itself. "He ran like a scut." --Skelton.
[1913 Webster]
How the Indian hare came to have a long tail, whereas
that part in others attains no higher than a scut.
--Sir T.
Browne.
[1913 Webster]
My doe with the black scut. --Shak.
[1913 Webster]