Final answer:
All sled dogs take joy and pride in the job of transportation, which is essential to their role and identity in working alongside humans, especially as depicted in London's 'The Call of the Wild'.
Step-by-step explanation:
Chapter 3 of Jack London's The Call of the Wild is titled 'The Dominant Primordial Beast', and it deals with the sled dogs' experiences and transformations in the wilds of the Yukon during the Gold Rush. The one job that all of the sled dogs take joy and pride in is transportation.
Drawing from deep-seated instincts and years of selective breeding, these dogs are historically known for their ability to haul and pull sleds across the frigid landscapes, making transportation an essential aspect of their identity. Their remarkable capacity for this work is a testament to their symbiotic relationship with humans and their role as companions and workers.