People and their pets have long had a connection that only the heart could prove to be true. Now, with studies done we can find the chemical evidences that could prove these connections to be true. Here are 4 things that happen when we pet or interact with our pets:

1. It improves the function of our immune system:

2. Your oxytocin levels double:

Your beta-endorphins and dopamine levels also increase. These neurochemicals are associated with being natural painkillers, the feeling similar to a "runner's high".

3. Increase in serotonin levels:

In a study by the University of Missouri, it was found that petting dogs led to a spike in serotonin. Serotonin is a neurochemical that is used in antidepressants.

4. They can help lower blood pressure by 10% in 15-30 minutes.

What happens when we pet animals are not learned behaviors. Humans have evolved to have a special human-animal bond that results in the change of neurochemicals and other bodily functions that improve our and their wellbeing.