Heart attacks can happen anytime and to anyone. Claire Nelson is very lucky to survive this deadly attack thanks to the help of her pet cat. One day in June 2011, Claire was very anxious to rest in her bed because she was not feeling well. But Rusty, the cat he's been adopting for two years, keeps pestering uncharacteristically. Unable to rest, the former nurse, then 66, decided to go to the doctor. However, his condition was felt worse as he was waiting for the bus and decided to call 911. Doctors at the hospital diagnosed him suffering a heart attack and immediately took surgery to save him. Recovering from his condition, Nelson finds Rusty's attitude back to normal. But, as if worried about his master's condition, Rusty was more often beside Nelson since then to guard him.