Phytonics Back Spray can be used on both muscles and neck and back vertebrae. The spray soothes muscles that are stiff or stuck following physical exertion. In animals with back problems, the muscles are often under excessive strain. The muscles are overstimulated and there is a higher muscle tension, which can lead to problems. Back spray contains several ingredients that have a relaxing effect on the muscles. Suitable for cats, dogs, ponies and horses.