Extras

    Video thumbnail: Nature Dogs That Changed the World (Part 1) - Preview

    Nature

    Dogs That Changed the World (Part 1) - Preview

    Airs Wednesday, October 5, 2011 at 8:00 p.m. ET/PT. Check your local listings.

    Dogs That Changed the World (Part 1) - Preview

    Video thumbnail: Nature Speedy Saluki

    Nature

    Speedy Saluki

    For 6,000 years, the Bedouin have bred Saluki for speed.

    Speedy Saluki