Star of Panadur

On the barren wastes of Europa, two marooned men fought, battling over an animal whose life one had saved. There was no fear in the animal's eyes—only the gleam of a weird unearthly knowledge that foretold the way the fight would end.
Hugh! Hugh! There's life here ... look ... look at this! Found it in a cavern! The shrill voice was exultant and gleeful.
Hugh Betancourt quickly rose from the fire he tended, and turned startled eyes on the furry bundle Jim Brannigan grasped firmly by the scruff of its neck. At first, nothing was visible but the liquid sheen of the thing's silvery fur; but as Jim roughly thrust it out, Hugh gave an involuntary gasp of surprise. The creature's small, triangular face was nothing less than beautiful! Its eyes were soft and large and luminous, like beryls, set wide apart. Above its broad forehead a short mane of silver fur, beginning in a widow's peak, fell back cloud-soft and shimmering. It was about three feet tall, slim, furred to the throat-line; a strange biped with slender arms and six-fingered hands.
Damn it, Jim, go easy! You've all but strangled it! Here give it to me. Hugh extended his arms.
Don't let it get away from you, it's faster than a jack-rabbit, Jim cautioned, extending the ham-sized hand in which he held the creature. Luckily, I surprised it in a sort of cave-like gully, where it couldn't escape. It means food, Hugh! Lots of food if we can find more of these animals!
For a moment, the incipient madness of many days on this hellish satellite engulfed Hugh in a wave of nausea. He remembered the gravity-screen tearing from its pivots, and the space-ship caught in the tremendous pull of Jupiter; the last desperate try at the controls, and then the tiny dark bulk of Europa curving up to met them headlong. There had been cheerless days of biting cold when the tiny satellite faced the distant pallid sun. There had been nights that were like a canto out of Dante, as they were bathed in Jupiter's red cold-glow. More recently, and for more reason, Hugh remembered the dwindling food supply which had now quite vanished.