A non-human animal model, method, spring, and kit for testing agents for treating wound scarring. The non-human test animal has a wound in a skin surface thereof, the wound having a perimeter edge； and a garter spring attached to the skin surface of the test animal in a position outside of the perimeter edge of the wound. The garter spring optionally has one or more bands for constricting the force exerted by the coil of the garter spring.
