Comparing dogs to other species sheds light on the versatility and limitations of the quadrupedal design. While four legs are common among terrestrial mammals, the specific adaptations vary widely. Cheetahs, for instance, sacrifice some stability for extreme speed, while bears possess powerful limbs for climbing and digging. The canine limb, with its specific musculature and bone structure, represents a balance, optimized for sustained running (like wolves) and agility, rather than extreme specialisation in a single domain. Contrast this with bipedalism in humans, which freed the forelimbs for manipulation and tool use, or the reduction of limbs in snakes. This comparative lens emphasizes that while quadrupedalism is a highly successful blueprint, its exact manifestation is always a result of specific ecological pressures and evolutionary trade-offs, making the dog's four legs a unique, albeit shared, success story.