How Much Water Should a Dog Drink a Day?

Many dog owners leave out water for their dogs all the time with the thought that they'll drink as much, or as little, as they need. But how much water does a dog need? Monitoring your dog's water intake can improve their health, prevent illness and insure proper hydration. While some dogs naturally do this on their own, some either under-drink or over-drink. Too little water can lead to dehydration in dogs, kidney stones, organ failure and even death.