Halloween for Pets

Do you dress your pets up for Halloween?  I have to admit, I have on some Halloweens.  One year, my girl chihuahua as a ladybug.  I also dressed her brother up, but I think it was just some kind of hat and he wouldn't wear it.  This year, I haven't decided yet about costumes for the dogs.  What about cats?  Has anyone ever dressed up their cat?