The American Kennel Club has an amazing post with helpful tips if you have a blind dog.
Humans rely on their eyes more than any other sense. Dogs, however, are different. In cases of gradual blindness in canines, many owners don’t even realize their dogs are losing their vision. This is because dogs use their sense of smell and hearing to navigate their world just as much, if not more, than sight. Sudden blindness, however, is disorienting, confusing, and often scary. Some dogs become fearful or aggressive, while others struggle to get used to their new normal. Luckily, there are things you can do to help improve your blind dog’s quality of life.