The amount of water your dog needs depend on various factors, including weather conditions, the duration of the hike, and your dog's size. As a general rule, bring at least one liter of water for every 15 kilograms of your dog's weight. On hot days or longer hikes, consider carrying even more water. Offer water breaks every 30 minutes during the hike to keep your furry friend adequately hydrated. Remember, staying hydrated is crucial for both you and your dog during outdoor activities.