The length and difficulty of the expedition made it necessary. However, Lewis and Clark did spare their best buddy.
Before leaving on the expedition, Lewis bought a Newfoundland dog named Seaman for $20. Lewis and Clark became very close to the dog and even performed surgery on its hind leg artery after it was bitten by a beaver.
At one point in the expedition, Seaman was stolen by Indians and Lewis threatened to send armed men after them to get Seaman back. Though the expedition ate 263 dogs, Seaman was spared. We certainly hope that Seaman was spared from cannibalism!