A tiger. In India a tiger is called Master Stripes.
“Catch old Stripes come near my bullock, if he though a `shooting-iron' was anywhere about Even if there were another Stripes, he would not show himself that night.” —Cornhill Magazine (My Tiger Watch). July, 1883.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Stripes from Fact Monster: