How does Billy Coleman describe his dogs?

I noticed the boy dog was much larger than the girl dog. He was a deeper red in color. His chest was broad and solid. His puppy muscles knotted and rippled under the velvety skin. He was different in every way. He would go closer to the fire. I saw right away he was bold and aggressive.

The girl pup was small and timid. Her legs and body were short. Her head was small and delicate. She must have been a runt in the litter. I didn't have to look twice to see that what she lacked in power, she made up in brains. She was a much smarter dog than the boy dog, more sure of herself, more cautious. I knew when the trail became tough, she would be the one to unravel it.