“The grass cats, big cheetah-like creatures with long slim legs built for running, were only a peril when the party left the yacht. Though fully capable of leaping aboard when the 'roller was in movement, they never did. Sometimes they might pace it for a mile or so, then they would contemptuously walk away.
Green wished he could say the same for the dire dogs. These were almost as large as the grass cats and ran in packs of from six to twelve. Sinister-looking with their gray-and-black spotted coats, pointed wolfish ears and massive jaws, they would run up to the very wheels, howling and snapping with their monstrous yellow fangs.”
The Green Odyssey, Philip José Farmer