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A dinosaur (Sauroposeidon) might have weighed 60 tons. But since these huge animals disappeared with the demise of the dinosaurs, one has to wonder if perhaps the Elephant is the largest practical size for a terrestrial creature, since the only bigger animals which have fared so well are those which are aquatic.
A planet with the gravity field of Jupiter might be unable to support life due to the size an animal would need to be to be strong and resilient enough to survive the crushing effect of both the atmosphere and the gravity itself. Too small and bone/cell strength might be insufficient, but as size increases to accomodate greater strength, so the need for still greater strength increases.
The fact that we don't see animals with the size of dinosaurs has nothing to do with practical size, but rather with the Oxygen percentage in our atmosphere. In the dinosaur era it was much higher than it is now, so in Earth's ecological system, O2 concentration is a limiting factor to the size of land animals.
You're only thinking of our known Calcium-based skeleton now. Who's to say that animals who evolve under higher gravity pressure don't evolve with a skeleton made of sturdier materials?