Veterinarians have four years postgraduate training just as do medical students. Some of my classes were with veterinary students while I was studying biomedical engineering. The classes were difficult.
Well, more to the point, there are less restrictions on administering new medications and vaccines to animals, since you don’t have to worry about consent laws or other human experimentation regulations. So veterinarians are often much more experienced than ordinary doctors in deploying new vaccines and seeing the effects on real populations. They are probably the one group of medical professionals who have, for example, the most real world experience with Antibody-dependent Enhancement, since they have actually experienced recent catastrophic failures of livestock vaccines that were caused by ADE.
Of course if you cause such a catastrophe in livestock populations you can just cull all the infected animals and stop the enhanced disease from spreading. That’s not an option we have in human populations. So maybe we can learn something from listening to veterinarians.