Some dogs are herders.
Some dogs assist folks with disabilities.
Some dogs are companions to humans. Some dogs guard livestock.
Some dogs sniff for criminals, bombs, drugs, illegal fruit and veggies, and even dead bodies.
Some dogs pull sleds. Some dogs guard house and home.
Some dogs kill scary, blue shower scrubby monsters.
Every dog has a job. Their primary job seems to love us unconditionally. I simply cannot imagine a life without one or two or more.