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Which two sentences best develop the character of John Messner?

A Day's Lodging
by Jack London (adapted excerpt)

John Messner seemed succumbing to the apathy of it all as the frost was benumbing his spirit. He plodded on with bowed head, unobservant,
mechanically rubbing nose and cheeks, and batting his steering hand against the gee-pole in the straight trail-stretches. But the dogs were
observant, and suddenly they stopped, turning their heads and looking back at their master out of eyes that were wistful and questioning. Their
eyelashes were frosted white, as were their muzzles, and they had all the seeming of decrepit old age, what of the frost-rime and exhaustion.
The man was about to urge them on, when he checked himself, roused up with an effort and looked around. The dogs had stopped beside a
water-hole, not a fissure, but a hole man-made, chopped laboriously with an axe through three and a half feet of ice. A thick skin of new ice
showed that it had not been used for some time. Messner glanced about himself. The dogs were already pointing the way, each wistful and
hoary muzzle turned toward the dim snow-path that left the main river trail and climbed the bank of the island.
"All right," he said. "I'll investigate. You're not a bit more anxious to quit than I am."
He climbed the bank and then disappeared. However, the dogs did not lie down, but on their feet eagerly waited his return. He came back to
them, took a hauling-rope from the front of the sted. It was a stiff pull, but their weariness fell from them as they crouched low to the snow,
whining with eagerness and gladness as they struggled upward to the last ounce of effort in their bodies. When a dog slipped or faltered, the
one behind nipped his hind quarters. The man shouted encouragement reats, and threw all his weight on the hauling-rope.