A new study shows that horses were domesticated about 5000 years ago. Dogs it says, were domesticated about 15,000 years ago.
Compared to dogs, domesticated as long as 15,000 years ago, and such food animals as sheep, goats and pigs, horses are relatively late arrivals in the human relationship.
This struck me as odd. If I was a dude and saw a dog and a horse 15,000 years ago I think I would want to chat with the horse, rather than a snarling dog. Not to mention I would think a dog could be less useful in carrying something for me, like a stick or whatever the heck was used at that time.
Then again, it is 2009 and I am typing this on the interweb thing, with a laptop wirelessly connected to billions of people. So my relationship to domesticating a horse in 3000 BC is not exactly like feet to socks.