A young man stands at full length, his body turned slightly to the left, his gaze directed outward with a composed and confident expression. He wears a black satin doublet and breeches, adorned with a large silver star on his left shoulder and a delicate lace collar that frames his face. A gold medallion hangs from a blue ribbon around his neck, resting on his chest just above his hands, which are positioned with one resting on his hip and the other gently touching the head of a large, fawn-colored dog.

The dog, seated at his side, looks up attentively, its head tilted and pressed against the man's hand, while its body is rendered with smooth, naturalistic brushwork. Behind the figure, a heavy green drapery falls in deep folds, contrasting with the pale, plain wall to the right, which creates a subtle architectural setting and emphasizes the sitter's presence. Light enters from the left, illuminating the man's face, the intricate lace, and the shimmering surface of his garments, while casting soft shadows that model his features and the folds of his clothing.

The palette is dominated by blacks, silvers, and muted greens, with the warm tones of the sitter's hair and the dog's fur providing gentle contrast. The paint is handled with a refined touch, especially in the textures of fabric, lace, and fur, where fine, fluid brushstrokes suggest both softness and structure. The composition is carefully balanced, with the vertical figure and dog forming a strong central axis, offset by the diagonal sweep of the drapery and the angular pose of the sitter's arm.

Small details, such as the rosettes on the shoes and the subtle highlights on the medallion, reveal the artist's attention to the sitter's status and individuality. Portrait of James Stuart, Duke of Lennox and Richmond was painted by Anthony van Dyck between 1633 and 1635. The Metropolitan Museum of Art lists this painting as part of the Marquand Collection, given by Henry G. Marquand in 1889.

The painting is recognized as a portrait, a genre in which van Dyck excelled during the 1630s.