00:00legendary dogs who changed history through courage and loyalty across frozen trails
00:07battlefields and scientific laboratories famous dogs pulled sleds guarded soldiers
00:12and reshaped how humans survive and explore the world balto sprinted across alaska in 1925
00:19hauled diphtheria serum through brutal snowstorms and helped save children during the gnome outbreak
00:24like a road aboard sputnik 2 in 1957 orbited earth above the soviet union and became the first dog
00:32launched into space sergeant stubby crossed world war one trenches in france warned sleeping soldiers
00:39about gas attacks and located wounded troops under enemy fire hachiko waited outside tokyo's shibuya
00:46station every day for nearly 10 years after his owner died turning the akita into a global symbol
00:52of loyalty barry the saint bernard searched snowy swiss alps passes in the early 1800s
00:59rescued stranded travelers and became one of history's most famous rescue dogs
01:04rin tin tin leaped across silent film sets in hollywood performed dangerous stunts and helped
01:11turn german shepherds into one of america's most recognized breeds from arctic blizzards to orbiting
01:17spacecraft these dogs crossed impossible terrain and stayed beside humans through danger war and disaster
01:25long after the footsteps vanished the stories of these dogs still travel the world
01:30world
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