Not to derail other dog threads, just moving my comments to over here. There is a deep bond between the humans and dogs, and they can communicate to a degree unusual between two separate species. Access to dogs superior sense of smell has allowed ours to dwindle, as we can use theirs. We also use their speed and capacity to defend us. They benefit from our intelligence and technology.
I don't think it is surprising that so many people need or want a dog in their lives, or that so many dogs want a human. It is what we have evolved to do, no matter how inconvenient, messy or expensive the relationship might sometimes be.