Over the past century, dogs and a few cats have been a favorite image to appear on postage stamps. Worldwide, there are now more than 4,000 stamps featuring dogs. Perhaps coincidentally, both the UK and the U.S. are issuing commemorative stamps showing rescued animals. The British Royal Mail has just issued a set to mark the 150th anniversary of the Battersea Dogs & Cats Home. All of the pets on the stamps were abandoned by owners and “rehomed” by the charity.