Dogs are great hiders of emotions, Limping could be from a number of things, has there been a lot of rain?? My dog limps when it rains because of arthritis. Have you checks the pads and paws, for any cuts?? I would definitely take the dog to the vet since the condition has moved to the other leg as well, until then try to keep kids away from the dog, sometimes they get snippy when they are hurting..
