Orthopedic braces and splints for use on a limb of an animal, that provide stability for unstable joints and limbs for short or long term support and function. These orthoses are designed to prevent the occurrence of, or reduce the severity of, a joint injury. These braces and splints can also be fitted immediately after corrective surgery, and can support and stabilize the joint while assisting or restricting the range of motion. Various embodiments of the orthoses are modular, thermoformable and may include an adjustable tensioning system, which in combination provide a custom fit for a wide variety of animals and injuries.