Many dog owners wonder when they can start running with their growing puppies. Running and jogging with dogs is considered "forced exercise", which is anything more than the puppy would do while playing with a dog of similar age. It is advisable to wait until 12-15 months of age (and up to 18 for giant breeds), when the bones are fully done developing, to start running with your dog. And when that time comes, please make sure to increase the distance very gradually.