Sketch the ribcage as an oval or barrel shape
Mark the centerline down the torso
Add the spine curve to show body tilt
Place the shoulder line above the ribcage
Place the hip line below the ribcage
Draw the ribcage width wider at the top and narrower at the bottom
Indicate the front plane with a slight curve
Add the side planes with soft tapering lines
Keep the chest rounded for a furry body
Connect the ribcage to the neck with a smooth transition
Connect the ribcage to the abdomen with a narrower shape
Add fur volume around the torso outline
Use simple construction shapes before details
Refine the silhouette with natural animal anatomy
Erase guide lines and keep the rib structure subtle