Although watermelon rind isn’t toxic for dogs, it can lead to other issues and therefore it shouldn’t be offered to your dog. If your dog eats a small amount of the rind, it’ll likely pass through. However, excess amounts of the rind can lead to choking, digestive issues, or even a digestive blockage. These risks, coupled with the fact that the rind doesn’t contain meaningful nutrition for a dog, means that it’s best to avoid offering it to your dog.