Some veterinarians are, particularly by animal abuse or cruelty cases. However, I wouldn't say that every veterinarian is disturbed by the general status of the world at large - veterinarians are a heterogenous group of individuals who just happen to all share a common profession.
There are veterinarians in every country in the world.
In 2011 in the United States, the average annual income for all veterinarians was ~US$90,000; however, female veterinarians make slightly less than male veterinarians, so their average ran closer to ~US$85,000.
As of 2010, there are upwards of 120,000 licensed veterinarians in the United States alone. In the world, I would imagine at least 1,000,000 practicing veterinarians.
The AVMA is not a credentialing body for veterinarians. It is a professional association. Veterinarians in the US are licensed in the state that they are working in by a state government agency.
Veterinarians are trained at accredited colleges of veterinary medicine. There are dozens of these schools around the world.
I would guess chiropractors - veterinarians tend to make US$100,000 or less per year.
No, it is not a profession that normally requires traveling the world.
In 2013, the average pay for a veterinarian was ~US$90,000.
Indestructible
Private practice veterinarians work as part of a team of people that includes vet techs, vet assistants, receptionists and kennel workers. Also, most veterinarians in the US practice in a multiple-doctor practice, so they also work with other veterinarians.
the end of the world
There is no composite ranking of the top 100 veterinarians or animal hospitals; few veterinarians want or need to start a rivalry by claiming to be the best. Therefore, I do not believe you would be able to find this information, as it doesn't exist.