A canine patient with osteosarcoma of the sacrum was subjected to low-field magnetic resonance imaging with the following sequences: FSE, SE, 3D HYCE, X BONE, Fast STIR, GE STIR and Gradient Echo. Due to the size and location of the tumour, surgery was not performed, and the patient was euthanized. A histopathological analysis of the tumour revealed telangiectatic osteosarcoma.