The phrase "human handler" refers to a person who interacts with and takes care of another person or an animal. They guide and manage them, making sure they are safe and well taken care of. Full definition
This class is intended only for human handlers; your dog will remain at home. (animalhumanenm.org)
If you want to bring three dogs, you'll need a second human handler. (zoomroom.com)
As Carolina Lucas points out in today's Guardian, the last time swine flu broke out in 1988, the finger was pointed to confined animal feeding operations (CAFOs) as one of the culprits - close quarters and cramped conditions with human handlers moving in and among the animals are all ready ways for contagion to spread. (treehugger.com)