cruel-hearted

I think Crab, my dog, be the sourest-natured dog that lives: my mother weeping, my father wailing, my sister crying, our maid howling, our cat wringing her hands, and all our house in a great perplexity, yet did not this cruel-hearted cur shed one tear: he is a stone, a very pebble stone, and has no more pity in him than a dog...