Bones includes the hard parts of the body such as claws, hooves, teeth, horns, and any body or back spikes. These can be colored a natural bone-like color (white or yellowed off-white), the same color as the base coat, or slightly lighter or darker than the base coat, assuming they aren't being affected by a mutation (such as Golden Bones, Silver Bones, Black Bones, Painted Claws, Glowing Bones) or Keratin Energy.
Flesh includes the paw pads, mouth, and nose, and the small triangle of flesh in the corner of the eye, but NOT the inner ears. Flesh can be any natural color such as pinks, reds, chow blue or slightly purplish, or brown. Natural blacks are fine for the nose so long as the lineart can still be discerned. Flesh can also be the same color as the base coat, or slightly lighter or darker. Any other colors desired will require Energy Soul.