I'm a long time horse owner and sometimes BO who boards other folks horses. I would NEVER suggest that someone give their horse anything more than Bute or Banamine, nor would I offer to administer the meds without a doctor's order. I very rarely ever do stuff like that for my own horses. When it comes to antibiotics and doctoring, that pretty much belongs to the vets, it's why they went to school for all those years and ran up those HUGE student loans. As a BO, after the horse has been seen by a vet, I would administer meds and do dressing/wound care on a horse IF the owner asked me to. There would be an appropriate charge for it too. Doing those services generally falls on the horse owner, if the BO takes on the tasks, they take on the liability for not doing things proprerly too. So if they agree to administer meds, it is definitely on them to see to it that they're done correctly and that the horse gets the appropriate dose. As the horse owner, it's on you to see that your horse is seen and treated appropriately when he's injured or ill.