Dean Koontz. Guardian angels (№ 165362)

The only absolutely unselfish friend in this selfish world, a friend who will never leave him, who will never be ungrateful and will not betray him, is a dog. The dog stays with the man in wealth and poverty, in health and disease. She will sleep on the cold ground, where the winter winds blow and the snow is blowing fiercely, if only to be near its owner. The dog will kiss the hand even if the hand can not give her food; she will lick the wounds and scratches were the result of collisions with cruelty of the world. The dog guards the sleep of his pauper master as zealous as if he was a Prince. When we leave all other friends, this will remain. When all the wealth will disappear and everything falls to pieces, the dog is as constant in his love as the sun marching across the sky.