JENNET, a small Spanish horse; the word is sometimes applied in English to a mule, the offspring of a she-ass and a stallion. Jennet comes, through Fr. genet, from Span, jinete, a light horseman who rides a la gineta, explained as " with his legs tucked up." The name is taken to be a corruption of the Arabic Zenata, a Berber tribe famed for its cavalry. English and French transferred the word from the rider to his horse, a meaning which the word has only acquired in Spain in modern times.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)