"Most dogs recover completely within a few weeks. In some cases the eye remains permanently clouded," says WebMD. Check with your veterinarian about what the normal eye color is for your animal's breed. Change in eye color can be a sign of several diseases. A dog with cataracts will normally have eyes that look cloudy or bluish gray. "Be aware, though, that it's natural for a dog's lens to become cloudy, or gray, with age.