Sola and Woola

"I had at least two friends on Mars; a young woman who watched over me with motherly solicitude, and a dumb brute which, as I later came to know, held in its poor carcass more love, more loyalty, more gratitude than could have been found in the entire five million green Martians who rove the deserted cities and dead sea bottoms of Mars."
—Edgar Rice Burroughs, A Princess of Mars