You're wearing shoes, but your dog isn't, so be mindful of hazards like hot asphalt, broken glass, pebbles and other dangerous objects in the road that may hurt his delicate foot pads. Your dog will likely go wherever you lead, so taking a dog's eye view of things couldn't hurt. Watch out for even a slight limp and if you detect one, slow down or quit for the day. Even benign street residue like salt on roadways can cause digestive problems for your dog if he licks his paws after a run. Pay attention to what your dog is doing and encountering, and inspect or wash his feet if you have any reason for concern.