You're wrong. Dogs do love humans. They've evolved to love humans. They evolved that way because the pack-behavior and imprinting that help them find food and fend off predators in the wild reacts well to a different-species dominant male (i.e., a human owner).
Jared Diamond writes extensively on the topic in Guns, Germs, and Steel, before going on to discuss how zebras, though pack-oriented, have never been successfully domesticated. Nor even very well tamed, except by the eccentric Walter Rothschild, 2nd Baron Rothschild, who once rode a zebra-driven cart into Buckingham Palace (
http://www.nhm.ac.uk/museum/tring/history/history.html)
PS-I propose you think dogs don't really love humans because they have reasons for loving us, while you expect love to be somehow, I don't know, unconditional and profitless for the lover. That's just crazy.