It's a little more complicated than that. The pig, in this case, is usually a piglet, which is roughly the same size and shape as a cat, and the trick is to sho

It's a little more complicated than that. The pig, in this case, is usually a piglet, which is roughly the same size and shape as a cat, and the trick is to show the customer/mark a real piglet being put in a bag, and then use sleight of hand to switch bags and hand him one with the cat in it, with the strong admonition not to open the bag before getting home lest the "pig" get out.