Careful use of a "cast" or splints or just special strong bandages can help many animals when they have injuries like damaged tendons or fractured bones. Sometimes they are just put on to keep a limb still when there are postoperative wounds and dressings.
Casts are not without problems as they can get wet, slip off, rub the skin, and the pet requires a lot of rest, ideally in a cage. Not always easy for theri owners!
Also, they may need to be on for many weeks to ensure bone healing where there is a fracture.
This site shows you a wide range of animals that have casts on.... just click to see them all. At least we now have a wide range of colours to choose from....