Dogs aren't just man's best friend—they form remarkable bonds with animals of all kinds. Dog's Best Friend shares heartwarming, real-life stories of unlikely canine friendships worldwide.
At the Columbus Zoo, Carlisle, a yellow Lab, soothes cheetahs and eases their nerves. In Florida, Mercury, a miniature therapy horse, and Sirius, a sheepdog, share a protective, playful bond.
S1E2 45 min