Redness in the whites of a dog's eyes may be canine distemper, or it may be caused by other reasons, such as irritation, eye diseases, bacterial infections, eyeball congestion caused by foreign objects, etc. You need to go to the hospital for examination. In addition to the symptoms of redness of the whites of the eyes, canine distemper can also cause symptoms such as shortness of breath, vomiting and diarrhea, fever, and poor appetite. If it is an eye disease, you can use anti-inflammatory eye drops, clean up eye secretions in time, and pay attention to your diet.