A rat appears on the Four of Cups in the Wild Unknown Tarot set of cards.
“Four cups line the bottom of the card, and a rat has himself sprawled out over the whole shebang. Rats are often associated with being sneaky and generally icky. This rat sure looks like he’s trying to hoard these cups to himself.
It conveys the keywords given by the deck creator – selfishness and greed.
The (tarot) rat is guarding what he has, unwilling to open himself to other possibilities, keeping himself focused on his own emotional landscape.”