Answer:
His concern for sled dogs...I believe it is his desire to help his furry pal. I was going to mention his worry for his sled dogs, but I lacked the rest of the context. "they do get on the nerves awful" is possibly referring to the sled dogs and how they get on his nerves.
Explanation:
It uses it to build magnets
Answer: He makes a comparison between the man with the muck-rake and journalists.
