Quotation from: The Call of the Wild

Written by: Jack London

In the excess of their own misery they were callous to the
suffering of their animals. Hal's theory, which he practised on
others, was that one must get hardened. He had started out
preaching it to his sister and brother-in-law. Failing there, he
hammered it into the dogs with a club. At the Five Fingers the
dog-food gave out, and a toothless old squaw offered to trade them
a few pounds of frozen horse-hide for the Colt's revolver that
kept the big hunting-knife company at Hal's hip. A poor substitute
for food was this hide, just as it had been stripped from the
starved horses of the cattlemen six months back. In its frozen
state it was more like strips of galvanized iron, and when a dog
wrestled it into his stomach it thawed into thin and innutritious
leathery strings and into a mass of short hair, irritating and
indigestible.