When Duffy, an 8-year-old Irish terrier rescue, got diabetes, the poor dog quickly went from being able to see clearly to total blindness. His owners were devastated to see their companion suffering. However, veterinarians were able to get the condition under control, allowing them to try surgery to restore the dog’s sight. The first moments after he gets his bandages off are something Duffy and his owners aren’t going to forget.Dog Time reports that one of the first signs of Duffy’s diabetes was when he started urinating in the house. Blood sugar tests confirmed it, and blindness struck quickly. Healthy Pets states that 75 percent of diabetic dogs go blind from cataracts, a condition that progresses rapidly and typically causes blindness within a year of diagnosis. This was true in Duffy’s case, as within about three to five months, he was completely blind.