Most people like to have dogs so that they can take them out for a walk across town. According to surveys, that was one of the most often cited reasons why someone would get a dog instead of cat - cats are nice and fluffy, but they never form as strong of an emotional bond, and you can't walk them outside. This woman though, she had an entirely different idea in mind.
She never found cats and even dogs to be satisfying enough, which is why she needs to have a set of apex predators (humans) to walk around town. She appears to be in an S&M relationship with at least three guys, and they choose to be walked like this around town. While this might look weird to onlookers - perhaps this man and the woman find happiness in this behavior?