Off the property, Daisy was never a biter. She was the type who would flip balls at the vet and poop, pee and express her anal glands all over herself (mostly for nail trims). We had to sedate her for trips for a little while, and I guess somehow the sedation helped her become a little desensitized because after a while she stopped needing it and she still stresses a lot (stress panting, drooling, yawning, shaking) but she doesn't flip balls anymore. It especially helps to have a female vet vs. a male vet, Daisy is much better with women. I also hold the pointy end if they are uncomfortable.
In public, I don't typically have a problem with people wanting to pet Daisy. Large black dogs tend to be imposing anyway, and even layman can plainly see that she's scared by the shaking and panting. She doesn't really go out in public though except for walks, to the nice lady that boards her and rocky when my parents go on trips (which is once a year), to doggie daycare, and to the vet.
Coco, the dog I had in childhood, was brought to the vet pre-muzzled and my dad or my mom would help with holding the pointy end. Coco was not a dog to be trifled with, but our vet was understanding and lovely.
"Give thanks to God for being dog. He gave us the joy of angels." - Trixie Koontz, Dog, Trixie Treats & Holiday Wisdom - Christmas is Good!