Anyone who doesn't have a trusted vet isn't much of a dogman. That is the first thing to look for.
I have lived in CA, FL, GA, and TN over the last 25 years ... and I always found a trustworthy vet anywhere I was at.
The only people who don't have a trusted vet, as far as any dogmen I know, are those who don't give enough of a shit and so don't bother to do the necessary investigation to find one.
I have traveled 3 hours at times, because that's how far a "good vet" was from me at one point ... but I knew where one was, and I traveled to him several times for various reasons when I had to.
So that is a crock of shit as far as I am concerned, because good vets are out there.
It's all a matter of the owner's determination to find them
Jack
BOTTOM LINE: I could go anywhere in the world, make a few phone calls to good dogmen in that area, and have the contact information for a good, dogman-friendly vet anywhere I got off the plane. And I could have this information within a few hours IFFF I gave enough of a shit to ask the right questions to the right people.