The ritual torture of cats was an element of popular festivities throughout the Medieval and Early Modern period, possibly with roots in pagan practice. One particularly bad time for puss was the Eve of the Feast of St. John. Here is Robert Darnton (as quoted in Wikipedia):

There can be no doubt that such practices did indeed persist into the Age of Enlightenment, but did 18th-century Parisians really "incinerate cats by the sackful"?