Buck adopted new wild instinct in his new world , did Buck become better or worse?

I think a motif or recurring idea in the book is that getting sent into the wild awakes Buck's latent primitive instincts. Buck goes from being a pampered dog to be the alpha-dog of the wilderness. In this sense, the wild does make Buck better. Buck becomes tougher and more in tune with his native habitat. Buck becomes the animal he was meant to be. In chapter two Buck speedily develops more heightened senses, hardened muscles, and an iron stomach. He becomes the son of his ancestors, and when he howls at the moon he repeats the same ancient song they sung before him. All of this comes about, because a gardener's assistant did not earn enough to support his family and his gambling habit.