I'm surprised they do that as well. I work at a daycare under a vet clinic. I get there earlier then the vets/techs, so I had to put Chesh in a cage and stick a neon sticky note to it confirming that she was there for annual and rabies only, no other vax period. I still had two techs come downstairs to confirm that I only wanted rabies. Yes, that hasn't changed in the 3 hours since I wrote the note.
To board, our animals have to be current on shots (unless the vet approves different) and on a heartworm/flea prevention, so we don't get too many truly holistic dogs. We did have the saddest chow ever, though, who had the most miserable skin I've ever seen on a dog. I reached out to pet him and literally recoiled when I felt how scabby and crusty he was. He had been treated under a holistic vet for several months, and wasn't getting any better. Our vet put him on some antibiotics, and when he went home 3 weeks later he so much happier and his skin was almost clear. Sad that he suffered for so long when it was an easy fix.