My 3 year old neutered male has recently begun to have a problem being able to jump onto the bed or even onto my lap. His hind legs seem "wobbly" or unsteady. Gabby has always been a jumper and climber and has not, to my knowledge had any falls that would cause an injury. As far as I have been able to tell, he is not having a problem urinating. He is not tender anywhere along his spine or in the kidney area. Up until three nights ago he has always slept on the bed with me, the last 2 times he tried to get on the bed his back legs just didn't seem to give him enough propulsion to make the short jump. He is having some difficulties getting up steps as well, though no problems in getting down them.