OK, all day long my family and I were out by the pool running around and there was Chester right by my side. As soon as it was time to go in at night he started to really limp bad. It was all of a sudden, nad I looked at his pads and saw nothing that would cause him to limp. Does anyone have any ideas what it could possibly be? I didnt get to see if he could walk thismoring cause he was sleeping when I left for work at 6:30. Thank you