<p>A holder for holding an item or a substance arranged for mounting on the back of a non-human animal. The holder has a housing (301) configured to hold the item or substance which has an upper surface (303) and a lower part (305) shaped to conform substantially to the shape of the animal's back. The lower part has a left side (305a) and a right side (305b) for positioning on respective sides of the spine of an animal. A region of enhanced flexibility is provided between the left side and the right side for positioning the region of the animal's spine. The region of enhanced flexibility enables the housing to flex so that the relative angular position of the left and right side can be altered.</p>
