Fido's Law Share definition Flag Dogs expand to fill the sofa available. Mutt: Dude--I can't sit down. Your sofa's completely covered with dogs.Jeff: Fido's Law, man. Fido's Law by Two Hep Cats June 2, 2013 0 0 Get merch Get the Fido's Law mug. Buy Now — $32.95 See more merch