Answer:
The guys came back to get them , discovered that the Old dog had died (Jack) and then 5 of the dogs came running over a hills and they had a big reunion. Then as they were loading up the dogs to leave, Max the little one ran away and brought Paul Walkers character to Maya who had a broke leg. They got in the cars after that and drove off.
The movie ended on a shot of a makeshift cross with two dog collars on it and dedicated it to the men and dogs that do research in Antarctica