I am the owner of the very first species to be domesticated, a dog.
I also have dogs. Mine are worker dogs so they herd.
What type of dogs are considered worker dogs?
Dogs that require jobs, sometimes they are  on the smaller/medium end of size.
Dog behavior
Dog behavior is the internally coordinated responses of individuals or groups of domestic dogs to internal and external stimuli. It has been shaped by millennia of contact with humans and their lifestyles. As a result of this physical and social evolution, dogs, more than any other species, have acquired the ability to understand and communicate with humans and they are uniquely attuned to their behaviors. Behavioral scientists have uncovered a wide range of social-cognitive abilities in the domestic dog.
Co-evolution with humans.
The
be placed with a flock or herd, depending on its size, the type of predators, their number, and the intensity of predation. If predators are scarce, one dog may be adequate though most operations usually require at least two dogs. Large operations (particularly range operations) and heavy predator loads will require more dogs. Both male and female LGDs have proved to be equally effective in protecting of livestock.
The three qualities most sought after in LGDs are trustworthiness, attentiveness and protectiveness—trustworthy in that they do