Final answer:
Brock's feelings about the ancient fictions in 'The Last Dog' can be described as curious and possibly skeptical, as he questions their reality and reflects on their place in the story.
Step-by-step explanation:
In “The Last Dog,” Brock's feelings about the “ancient fictions” can be described as curious and possibly skeptical. This can be seen in the way he interacts with the fictions and his observations of them. For example, Brock is intrigued by the imagery and descriptions of the Yukon setting in the story, but he also questions whether humans truly belong there. Additionally, Brock may struggle against the idea that the fictions are real, as he is depicted as having a discerning and analytical mindset.