It's funny, but "dignity" isn't the first word that came to mind when I viewed these pics (only two from a list of thirty-one "pet Halloween costume ideas!").
I understand loving your pets. They're amazing companions, and most of them are more loyal, good-natured, and--dare I say it?--intelligent than humans. But must we anthropomorphize the poor beasts? Can't we show our love and appreciation without subjecting them to the indignity of silly costumes?
At least these animals have it better off than Tinkerbell. That poor dog not only has to play dress up every day, but also has the unlucky fate of spending every minute of it's life with this.