This all sounds a bit strange. No sedative for teeth floating? That's a new one for me. I've never heard of a horse having his teeth done without sedation. But maybe it's done elsewhere. Even so, was she bitted for the lesson? I wouldn't put a bit in a horse's mouth right after having their teeth floated. Can you imagine someone putting metal in your mouth right after going to the dentist? But I suppose maybe it depends on what they did. Maybe just a superficial hand-filing... but still it seems odd to me. As for the vet, it sounds like they have a relationship with the BO, not you, which is problematic. And it sounds like the BO is desperate to use Katie for lessons whether it's the right thing to do for her or not. That's not acceptable. If they don't have enough lesson horses, they need to buy more or cancel some lessons. My coach has 19 horses, most of which can be used for lessons. It happens regularly that some horses are off for the day -- either because they just came from a two-day show, have an injury, are coughing, etc. etc. We have to rotate them around so they each get time off. It's not acceptable to put a lesson program before the well-being of a boarder's horse. Period.