Se presenta un caso de persistencia de arco aórtico derecho en un cachorro. Se describen los signos clínicos del caso, los medios radiográficos de contraste utilizados para llegar a su diagnóstico y la confirmación del mismo por la necropsia.The A. A. present a case of persistent right aortic arch in a pup. After a brief introduction about the anatomy and embryology of this abnormality, they describe the clinical features of the case. The dog was euthanized because the owner doesn't accept the surgical treatment. The case is present in lateral and dorso ventral radiographies and also the necropsia findings.Facultad de Ciencias Veterinarias