When Amy Jung began to have a life-threatening diabetic reaction, she had no idea that the pet she had just adopted, a 21-pound orange and white cat named Pudding, would be the one to save her life.

Pudding the cat is big. He is orange. He is laid-back. And he’s a lifesaver. Just ask the 36-year-old woman who credits 21-pound Pudding with saving her from the grip of diabetic seizure the day ...