The image of modern farms today can be somewhat misconstrued because people are unfamiliar with what a modern farm may look like. I think the same can happen with a modern farm veterinarian. Not necessarily the physical attributes of the vet, but the tools they use and the way they perform their jobs. Take this for example, I bought my husband a medical bag that he could use to carry some essential items in a hurry. That bag, with it's few essential items, rides around in our "family" vehicle in case one of us or one of our dogs gets injured unexpectedly! It's cute but it's just not suited for the modern farm veterinarian (silly me)!
Advances in technology and medicine have improved the veterinary profession and the overall understanding of the health of the animals. You will see the symbol of the American Veterinary Medical Association on the back of the vet box. Here is some information I found on the internet:
The rod of Asclepius is an ancient symbol associated with astrology, the Greek god Ascelpius, and with medicine and healing. It consists of a serpent entwined around a staff. The serpent and the staff have various interpretations some of which represent the nature of the work of a physician, dealing with sickness and health, and life and death. The V superimposed over the serpent and staff is the symbol for the veterinarian.
So if you see a truck zooming around like there's no tomorrow with a vet box on the back, you can guess why they are in a hurry to get somewhere!