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