TY - SER AU - Voll,J. AU - Voll,R. AU - Gaiga,L. AU - Pigatto,J.A.T. AU - Teixeira,F.dos S. TI - Atlantoaxial instability secondary to agenesis of the odontoid process of the axis without rupture of the dorsal atlantoaxial ligament in a dog KW - CIRURGIA KW - CÃO ER -