A rat poison seller and his servant, inspired by a 1632 etching by Rembrandt, are depicted standing together. The rat-catcher, positioned on a square plinth with his right leg forward, holds a cylindrical cage containing three dead rats, one eating and another attempting to leap against the bars. In his other hand, he holds a packet of poison. The servant, walking beside him, carries a small box bearing the coat of arms of Utrecht and Amersfoort, while the rat-catcher wears a fur-lined, slightly frayed coat and a sash holding a cutlass. The figures are portrayed in a naturalistic style, reflecting Van Swol's ability to capture the essence of the characters with remarkable realism, while the rat-catcher’s costume, including puffed trousers and a fur hat, evokes the attire of the period. This piece, featuring figures of low social standing, follows the tradition of 17th-century Dutch genre painting.