DCHP-1 Online
choo 
interj. a call to sled dogs.
See also: choc
- 1902 (n.d.) ". . . Ah! Would you? Goon! Chook, Miriam! Chook! The thing is to get the first one [sleigh dog] across."
- 1913 Seresto . . . swerved, in spite of my yelling "Choo", to the right, off the trail he had been following. . . .
- 1902 (n.d.) ". . . Ah! Would you? Goon! Chook, Miriam! Chook! The thing is to get the first one [sleigh dog] across."