I keep a binder for each horse with all his health care records including veterinarian, farrier, dentist, etc. Initially it only started with vaccinations and farrier work but I began to expand it to include joint injections, surgeries, injuries and anything that pertained to that horse. Since most veterinarians will leave a copy of what was done at a particular visit, it is easy to include that paperwork in the binder. The same goes for the dentist and farrier. This becomes especially important if your horse develops chronic problems, such as a lameness because it will help track when the problem started as well as which treatments proved successful or not so successful. If a second opinion is needed, all the previous records will be available to refer to. If you decide to sell the horse, being able to give to new owner all information regarding vaccinations, dental work and farrier records is invaluable.