This is a key metaphor for the distinction between a traditional server and the way system images are treated in cloud computing. This comes up a lot in slides for Fedora talks recently (especially as we talk about Fedora Cloud and Fedora Server products). It's common to reference slides like this one from CERN http://www.theregister.co.uk/2013/03/18/servers_pets_or_cattle_cern/.

However, the licenses for that slide and its images are unclear, as is the case with most things that come up in searches. Additionally, while I love the internet cat meme as much as anyone else, it'd be nice to have something that seemed as home in slighly more formal documentation as it does in a slide deck.

If the illustration could also reflect the difference in treatment, that would be awesome. (Pets are named, individually cared for, and highly valued; cattle are numbered, and treated as interchangeable and replaceable.)

Thanks!