I think since they're in the arctic, Superman is trying to get to the fortress but couldn't make it because he's badly injured, so Krypto is helping him get there.
As a person with zero Superman Lore knowledge whatsoever, Krypto The Superdog sounds like something someone made up to troll me with. ala "the word gullible isn't in the dictionary, yuh-huh I checked myself it's not there i swear!"
for real. I was ready to write off any new DC movies for always trying to be so dark and serious and then they have the bestest goodboy show up and drag his ass across the Arctic.
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Do not reply to tell me actually it's not a random dog, it's Krypto the superdog.
(I am waiting for my partner to wake tho bc it will be more fun to watch the trailer together)