All roads isn't all cannon. Horses were not cannon to New Vegas even though Chance's story depicts them. I think the excuse that was used to allow them, is that Chance is too strung out on Chems and was semi delusional.
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Check out my Fallout Alaska Fan Lore Master Thread 2, pop in, leave a suggestion, or simply comment. Why is it called a Master Thread? Well because it's where all my updates will go first.
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Explorers of the New World Updated regularly. It's about Alaska and the Wackiness that ensues therein.