Most dogs should drink about 1 ounce of water per pound of body weight each day, so a 30-pound dog usually needs around 30 ounces daily. If you are asking how much water should a dog drink, that number is the best starting point, then you adjust for weather, activity, diet, age, and health. Water is one of the simplest parts of pet care, but it affects almost everything your dog’s body does. Good dog hydration helps with digestion, temperature control, joint comfort, energy,