Curly is supporting character during first two chapters and first killed dog in story.
Going to Yukon
During the first day, Curly tries to act friendly to one of the dogs. But dog attacked Curly and rip off her face. Curly tried fighting back, but she doesn't succeed and soon she drops to the ground, where other dogs attacked and tore her apart. Francois and Perrault arrived to save her, from angry huskies, but she was already dead.
Curly later was mentioned, when Buck remembers everything what happened to him in Santa Clara Valley or in Alaska.