Ensuring a dog doesn't overheat during hot weather is crucial to prevent heatstroke, a potentially fatal condition. Dogs cool down differently than humans, primarily through panting and limited sweating through their paw pads. Overheating can lead to symptoms such as excessive panting, drooling, lethargy, and even collapse or organ failure in severe cases. By keeping dogs cool, offering plenty of water, and avoiding intense activity in high temperatures, owners can protect their pets from the dangers of heat-related illnesses and ensure their safety and well-being.