Resumen En el presente informe se expone el caso clinico de dos caninos de raza Schnauzer, que presentaron un cuadro agudo de monoparesis de miembro toracico, seguido de hemiparesis, sin reporte de trauma fisico o ejercicio vigoroso previo. El diagnostico tentativo de infarto fibrocartilaginoso (IFC) obedecio a evidencias clinicas como: aparicion aguda y no progresiva del cuadro, compromiso hemilateral, ausencia de dolor a la palpacion de la columna vertebral, raza y edad de los pacientes. Palabras clave: embolia fibrocartilaginosa, hemiplejia, infarto fibrocartilaginoso, medula espinal. Summary In this report the clinical cases and the medical evolution of two canine of Schnauzer breed are examined. The dogs presented an acute clinical picture of monoparesis of the thoracic limbs, followed by hemiparesis without evidence of physical trauma or previous vigorous exercise. The tentative diagnose of fibrocartilaginous embolism (EFC) is supported by clinical evidence such as: acute and non progressive appearance of the clinical sings, hemilateral commitment, absence of pain to spine palpation, as well as breed and age of the patients. Key words: fibrocartilaginous embolism, fibrocartilaginous infarct, hemiparesis, spinal cord.