My 5 months old lab mix had an overnight stay at pet hotel from PetSmart yesterday and when he came home he got a bath, but then he is having loose stomach. Although I provided them with the food he is used to so that to be consistent but not sure if they fed him something else or he is under stress may be. Please suggest if this is normal for them to show such symptoms after a day at pet hotel or he needs to visit his vet.