This cabinet card photograph came to me from Herefordshire, England, but could have originated elsewhere. It has nothing written or printed on it.
Update (March 31): In response to an email I sent, Susannah Coster at The Postal Museum, in London, narrowed the date range of the photo to 1900-1910:
Susannah also informed me that cats have been working for the Post Office since at least 1868!
A cat or a dog can be a great comfort. They need a lot from us, but they give so much in return. They make us better people. And we never forget them, ever.