In the past 20 years, diagnostic imaging has seen many exciting new modalities gain recognition. Diagnostic ultrasound is harmless, painless, and less expensive than the other imaging techniques. In this article has reviewed physic of ultrasound, interaction of the sound beam with tissues, and diferent types of display format. Potential application of ultrasonography in veterinary medicine in Chile were analyzed. Key Words: Ultrasonography, diagnostic. Palabras claves: Ecotomografía, diagnóstico.-