Also this link on running with dogs:
EXERCISE IS EXCELLENT. A tired puppy is a GOOD puppy. Forced exercise (running, jogging, conditioning) should be left until after 18 months of age and preliminary hip and elbow exrays, but your puppy needs plenty of time to play and be active. Fresh air and outdoor fun is very important for a young growing puppy. Go for short casual neighborhood walks. Toss toys for him using the retractable lead. Have several of the same toy, and teach the pup to come back and play "trade" for what he has in his mouth. You can also trade for treats. Don't reach out to the dog, or try to take anything out of his mouth. Instead, offer him another toy or a treat to trade. Hold the article you are trading close to your body so the dog has to come all the way in. Make a point of touching the collar each time you trade. Each time he releases an object to you, say "OUT." This is a marvelous exercise that teaches the retrieve, the release, helps with the recall, puts you in a leadership position, and is great fun and exercise for the pup. Once he is coming back reliably, you can reduce your useage of the lead if you are working in a safe fenced area. Keep in mind, working on a leash or a line gives you an immediate way to help your pup make the right choices.
Keep your dog's breed in mind when planning your exercise routine. Small dogs with short legs usually don't need to ... or should not ...be walked or jogged as long as larger dogs.
Breeds with short noses may have trouble breathing when exercised vigorously. Short-snouters range from little pugs to bulldogs to boxers and many others.
And don't assume that racing breeds such as Greyhounds and whippets can run marathons. While they are built to run, they were not breed to run for long distances.
And for young pups and big breeds of any age, sustained jogging or running is too hard on their joints.
and lots more helpful advice on running with dogs at
Always remember your dog’s limitations – and remember that dogs will always try to please you, even at the detriment of their own health so don’t inadvertently force him to do anything he struggles with. Some breeds are simply not designed for sustained exercise, such as the brachycephalic breeds (e.g. bulldogs and pugs) with their shortened muzzles.
NEVER run with a puppy or a young dog whose limbs might still be growing – you can cause serious damage to his joints and bones which may not be reversible. Most dogs should not engage in forced exercise until over 1 year of age and for giant breeds, which mature more slowly, this may be even later. Consult your vet and your breeder for the best time to start exercising with your pet.