Red and tearful eyes of a dog that cannot be opened may be caused by foreign matter, inflammation or disease. The owner can check whether there is any foreign matter in the dog's eyes and help the dog clean it up. If it is caused by other reasons, it is best to Take your dog to the pet hospital for examination and treatment. Guide the dog to drink more water, or feed it some vegetables and dog food with high water content to help the dog replenish water. Pay attention to dog hygiene, bathe it regularly and deworm it.