My wife picked up Riley from Daggy Day Camp at PetSmart and he was fine. He got in and out of the car fine. Then all of a suddend out of nowhere he starts to limp. He doesn't wine, yelp, or make any pain sounds. It looks like it his from his front left leg. When I touch it or squeeze it, he doesnt show any effects. Does anyone have any ideas what I can do. Poor guy cant even get up and down without a problem.