Because Paris Hilton has already bought every other dog accessory
Tinkerbell needs something new: doggie glasses
This reminds me of when I took her Royal Highness, Kitty, to the vet once shortly after we first got her. The conversation went something like this:
Vet: *examining Kitty's mouth* She has an overbite.
Me: So, what does she need? Kitty braces?
Brother: *snikering*
Vet: *not amused*