Question
What should I look for when buying a dog?
Answer
Another early meaning was "kitchen maid or drudge" (c. 1450), a meaning retained as late as the 18th century, when hard knots of dough found in bread were referred to as "slut's pennies." A notable example of this use is Samuel Pepys's diary description of his servant girl as "an admirable slut" who "pleases us mightily, doing more service than both the others and deserves wages better" (February 1664). In the 19th century, the word was used as a euphemism in place of bitch in the sense of "a female dog."
— Source: Wikipedia (www.wikipedia.org)