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Location: Shadowland, Australia
Joined: Apr 2004
Posts: 7,358
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At that age a giant should not, and does not need to, run or to engage in any vigorous exercise whatsoever.
His immature joints and bones are very vulnerable to permanent, painful, damage. Until he is around 2-3 years old formal walks should be limited. Do not allow him to jump up and down on furniture, or to jump in or out of the car, do not allow him to run or struggle up and down stairs, do not allow him to engage in rough-housing with other dogs and people.
Be grateful that he does not want to over-exert hiimself
ETA - if you think that there is any physical problem then, of course, you should seek veterinary advice.