We all love a cute animal card or poster, but did you ever realise the amount these little animals were raking in? Pet millionaires, so they are - Grumpy Cat has to struggle to keep that desperate expression with all the catnip he's sitting on. This documentary looks at the owners and agents (that's right, some of them have agents) of these pets whose job it is to both look after and find these four-legged stars who make it into the calendars, mugs, cards and t-shirts that are bought in their droves.