This gorgeous Boston Terrier is Murphy! He couldn't bear weight on his hind limbs - the left side being most affected. Murphy was suffering from a patellar luxation or dislocated knee cap. Patella luxation occurs when the dog's kneecap (patella) is dislocated from its normal anatomic position in the groove of the thigh bone (femur). It can only be returned to its normal position once the quadriceps muscles in the hind legs of the animal relax and lengthen. This is why most dogs with the condition will hold up their leg for a few minutes. Murphy had surgery performed by Dr. Hurley to correct the problem and his owners report he is doing much better!