Identify the key points from the following story and explain each briefly.
- The science of pet therapy has been studied, which has shown that people interacting with pets have lower levels of stress hormones and higher levels of “feel good” hormones.
- Dogs are social learners that can be trained to do various tasks, while cats are independent animals that stay close to their surroundings. 
- Studies have found that cats can hear a stranger’s voice and knew who it belonged to without having ever met them before.
- Cats have been found to be social learners that rely on visual cues to interpret their environment. 
- Studies have also shown that petting a dog can decrease anxiety and help the person become more relaxed.