A couple of years ago, my vet came out to do coggins, and he had some of his vet students with him, so he was more thorough than usual. He checked my horse's teeth and announced to the student recording that he was 20 years old. I corrected him, saying he was only 14, and I showed him my horse's racing tattoo and his JC papers.
We discussed it, and he explained to me and his students that aging by teeth wasn't always accurate because something like neglect or trauma could affect his teeth, making the horse look older. (This wasn't a shock; he came to us as a rescue case.)
The other thread got me thinking, if I were to sell my horse, a vet doing a PPE might think I were lying and relay that to a buyer. It doesn't matter in my situation because A) I'm never planning to sell my horse and B) I have evidence to back up my claim. But I could easily see the situation being different.
Don't get me wrong, if I've got no other proof or reason to believe otherwise, I'm happy to go by what the teeth say, and I don't mind taking the word of a good vet. But I've worked for/around enough veterinarians to know that sometimes a few of them get arrogant and forget that others have horse knowledge too, and they refuse to listen.
Okay, long post short: Anyone else ever run into this?