It must be Halloween season ... Say No to Crack has its pick of the Top 10 Pet Costumes, which includes selections for both dogs and cats.
The picture on the left is actually not a costume - it's actually not even a true painted cat. Just a spoof from the Book Why Paint Cats by Burton Silver and Heather Busch.
Why Paint Cats was actually inspired by another strange book, Why Cat Paints, also by the same authors.
Links: Top 10 Pet Costumes at Say No to Crack, Why Paint Cats and Why Cats Paint books.
http://www.topblogcontent.com/2007/10/19/halloween-dog-costumes/