Dogs can not only look out for people, but sometimes save lives. A woman in Iowa suddenly fainted from a heart attack in the yard and the neighbor's dog barked until the master came to find the patient.

According to AOL media, a woman named Marcia Allen in Iowa has a heart attack. On 17 January, she suddenly fell unconscious in her own yard and was unable to call for help. A black dog named Mack from the neighbor's house came to the yard and found her.
Seven-year-old Mack was a very quiet dog, almost never barking. But when Allen fainted across the fence, it immediately started barking. The owner of Mack, Dave Scott, was about to go to work and send the children to school. But when Mack kept screaming, Scott immediately came out and immediately discovered that Allen, who had been his neighbour for 21 years, fell in the corner of the yard. He immediately called an ambulance and took Allen to the hospital. After treatment, Allen is now out of danger and is well recovered.
When I knew what had happened, Allen said, "I couldn't talk at all. It's incredible how long it's been screaming, so loud, almost crazy. The sixth sense tells it that bad things happen." Allen thanked Mack very much for saving her and said, "Mack is a hero, a great dog. He's great, or I might lie on the ground for a long time."
Scott also said, "I heard Mack barking, and it felt very strange because it never called it that. But if it wasn't, I wouldn't even be in the yard. It's all the help of God."