An in-vivo experiment was developed to identify the biorheological properties of the spinal cord of puppies under uniaxial deformation. For strain less than 4–5%, the ratio between stress and strain was about 2.65 x 106 dyne/ cm2. It was found that the sensory response and motor function of the rear limbs of the puppies were recoverable after the spinal cord segment at LI was stretched once by 10–50%.