Balto's Legacy Lives On Through Genetic Insights

Researchers use Balto's preserved remains to uncover the genetic makeup of Alaska sled dogs

Published on Mar. 7, 2026

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A dog that pulled his way into history has given scientists insight into what makes Alaska sled dogs and other working breeds unique. Researchers have used a tiny patch of skin cut from a taxidermy mount of Balto, the hero of the 1925 Serum Run, to determine that he had no wolf in his recent background and was full of mixed-breed vigor, adapted to make the most of a diet that included starch. The discoveries about Balto's genetic makeup provide clues about the unique traits of sled dogs that have allowed them to thrive in Alaska's harsh conditions.

Why it matters

Balto's story captivated the nation in 1925, but the recent genetic analysis of his remains has provided valuable insights into the unique adaptations of Alaska sled dogs. These findings could help modern mushers optimize the diets and breeding of their dogs for maximum performance on the trail.

The details

Researchers extracted DNA from a small skin sample taken from Balto's taxidermy mount at the Cleveland Museum of Natural History. They found that Balto, a black husky built like a tank, was full of mixed-breed vigor and was adapted to make the most of a diet that included starch, in contrast to wolves and Greenland sled dogs. This suggests that through domestication, sled dogs have become better able to process non-meat food sources, which is important for the high-energy demands of sled dog racing.

  • On Feb. 2, 1925, musher Gunnar Kaasen drove Balto in lead position of a 13-dog team into Nome while carrying packages of diphtheria serum.
  • In 2007, one-year-old Anna Rozell admired a statue of Balto in Central Park of New York City.

The players

Balto

A black husky sled dog who was the lead dog on the final leg of the 1925 Serum Run that delivered diphtheria antitoxin to Nome, Alaska.

Gunnar Kaasen

The musher who drove Balto's sled team on the final leg of the 1925 Serum Run.

Heather Huson

A researcher at Cornell University who studied Balto's preserved remains to uncover insights about the genetic makeup of sled dogs.

Cristina Hansen

A veterinarian at the University of Alaska Fairbanks who has served as head veterinarian for the Yukon Quest and Copper Basin 300 sled dog races.

Kathleen Morrill

A co-author of the paper on Balto's genetics from the University of Massachusetts Chan Medical School.

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What they’re saying

“Through domestication, dogs became better adapted to a diet shared with people, which includes a lot of non-meat food sources and requires enhanced starch digestion.”

— Kathleen Morrill, Co-author, University of Massachusetts Chan Medical School (Science)

“Sled dogs don't have many breed-associated diseases. They aren't bred for physical traits, they're bred for performance.”

— Cristina Hansen, Veterinarian, University of Alaska Fairbanks (kvakradio.com)

What’s next

Researchers plan to continue studying Balto's preserved remains to uncover more insights about the genetic adaptations of sled dogs, which could help modern mushers optimize their training and feeding regimens.

The takeaway

Balto's remarkable story and the recent genetic analysis of his remains have provided valuable clues about the unique traits that have allowed Alaska sled dogs to thrive in the region's harsh conditions. These findings could help shape the future of sled dog racing and the care of these remarkable working animals.