Your dog's eyes suddenly lose their glow and the union of the eyelids begins to redden and there is a sticky pus-infected secretion. Besides, he becomes less active and starts eating less or none at all. His temperature in these cases is normally above 39 degrees Celsius. This is not a mere case of conjunctivitis, in fact these symptoms may well be the announcement of a serious infection, maybe the feared distemper. If you notice these symptoms, my only advice is to immediately call your veterinarian in no more than 24 hours! You are, in any case, faced with an infection which needs to be treated.