Coat first
A dog portrait succeeds or fails on the coat. Short, dense coats (Labrador, Boxer) are painted with directional strokes that follow the muscle underneath; long or double coats (Golden Retriever, Husky) are built in layers from the undercoat up so the surface hair sits on top. Wire coats get a broken, dry-brush edge; curly coats are massed as shapes of light and shadow before any individual curl is drawn.