My puppy jumps on and off of furniture and I am concerned about his joints and health?

At his regular exams, ask puppy's vet to assess his joints and if applicable make a recommendation. My adult dog's vet does that and the supplement he takes has 4 levels of strength based on the individual dog's evaluation.

My 12-year old dog's leg is currently splinted and bandaged for 6 weeks because he fractured a toe doing just that, i.e., jumping down from a chair I suspect. I wasn't home when he did this but he was fine before since we had been outside for a walk. I wouldn't expect a puppy's bone to break/fracture but it is probably a good thing to discourage the habit now.