What was happening with Buck’s feet? What was the solution? Why did this happen to Buck only?

Buck's feet were getting hurt because his paws weren't used to the rough terrain. The solution was Francois made Buck moccasins. Later his paws hardened up and got used to the terrain. This only happened to Buck because Buck was not a husky and not used to the terrain. He was a house dog before which made him not prepared for tough work.

Explanation:

you can infer that to folke dude was spying for allied nations

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."