Summary The crab‐eating fox ( Cerdocyon thous ) is a wild canid distributed throughout South America. It is one of the wild canids reported being hit by vehicles and injured in snares, thus inducing trauma or injury to the musculoskeletal system, possibly occurring in the brachial region. The main objective of this research was to provide an anatomic description of the crab‐eating fox's intrinsic brachial muscles including shape, origin, insertion, innervation and arterial blood supply, compared with that of the domestic dog. We dissected from superficial to deep two thoracic limbs of seven dead specimens donated to the University of Caldas by CORPOCALDAS . These muscles presented anatomic characteristics similar to those reported in the domestic dog ( Canis lupus familiaris ) but with a variant in arterial blood supply, allowing us to suggest that surgical procedures that need the knowledge of intrinsic brachial muscles in the crab‐eating fox may be homologous to the domestic dog. However, one should consider its variant arterial distribution by part of the collateral radial artery and deep brachial artery to prevent incorrect incisions that may damage these arteries.