A well-hydrated dog requires water balance. Water ejected from a dog's body via urine, panting & feces must be balanced by water intake. It's a balancing act, particularly since dogs' water reserves don't refill as rapidly as ours do. Dehydration is one of the most dangerous conditions a dog may face. Their eyes might be a warning indicator that dehydration is taking hold when it reaches critical mass. Tears cease accumulating in the corner of a dog's eyes, making its eyes look sunken. In addition, their nose may be dry rather than wet, as it should be. If your dog's gums are dry, gummy, or pale in color, it might mean they are dehydrated.
Humans can go up to three weeks without food, but only approximately a week without hydration in mild conditions. Because our animal friends aren't as big as us, they can only last up to a week without food and around three days without water. As a result, it's critical to keep your dog always hydrated so that they may perform at their best and avoid any health problems that may arise because of dehydration. Water is necessary for dogs to regulate their body temperature. Panting is their means of keeping a proper body temperature. They don't sweat as much as humans do. However, they do sweat to some level, as previously stated. They primarily sweat via their paws, though.
On a hot day, you could even see moist patches under their paws. It is since they only sweat infrequently. When they pant, though, their tongue nearly doubles in size, speeding up the removal of moisture and cooling their bodies even quicker. It is the most effective technique for them to expel heat from their bodies.