A device for measuring anatomical dimensions of animals, and particularly the angle of inclination between the occlusal plane of an animal, defined by the contact surface between its upper and lower dental arches, and the alternative reference planes passing either through the anterior sagittal point and the temporomandibular joints, or through the anterior sagittal point and the eyes of the animal includes an element of contact with the animal, at least one first movable member attached revolvingly to the contact element around a first axis of rotation, and at least one graduated scale situated on the contact element, or on the first movable element to enable the measurement of their relative rotation. The contact element also includes a locator plate sized to fit inside the animal's mouth between its upper and lower dental arches, and to be aligned with the occlusal plane.