Us. It doesn't make sense to say "was more useful to you than to we"
I don't know if there are options to choose from, but I'll explain what happened. Pike was a dog who refused to do his duty one morning, but hid and kept sleeping. So, Spitz, who is the alpha male, the leader dog, punishes Pike. Buck, the dog-hero of the story, tries to interfere and clash with Spitz, but to no avail because Francois, the human leader, whips him. So, Spitz manages to punish Pike for his disobedience.
Answer:
The weather has been nice but, it may snow again any day.