During these hot summer months it’s important to keep an eye on how much water your horse is drinking. If your horse doesn’t consume enough liquid, he could become dehydrated. Worse, he could develop impaction colic because there isn’t enough water in his digestive tract, making his stools hard to pass. While you’re inside sipping lemonade, your horse could be refusing to drink due to an accumulation of algae in his water. Or he might be dropping pellets or grain into the water, which quickly sours in the heat. And of course there is the chance that your horse took dead aim and pooped in his water. All of these possibilities are reasons why keeping your horse’s water clean is a daily chore in the summer months.