Begin with brand, papers and history
A Mustang's file starts with documents many horses never have. Keep the adoption or purchase paperwork at the very front, together with any title or transfer documents that follow, and record the freeze brand on the left side of the neck in writing and in close photographs, since that brand encodes the horse's identity and origin. Note whatever history came with your Mustang: where the horse was gathered, time spent in holding, previous adopters if any, and what handling was done before you. Photograph the whole horse from both sides as well, showing build, colour, markings and condition on arrival. This matters because a Mustang's identity is proved by paperwork and brand together.
Keep the gentling diary as the core record
For a Mustang, the training diary is not an extra; in the first months it is the most valuable record you own. Write a short entry after every session: what you worked on, from first touch and haltering to leading, tying, grooming and picking up feet, plus how the horse responded and where you stopped. Note setbacks as plainly as wins, including what startled the horse, how long settling took, and which approach worked better next time. Record who handled the Mustang, because a horse who accepts one person may still be wary of strangers, and that distinction protects future helpers. Over weeks, this diary becomes the evidence of a gentling programme actually progressing, and it lets a trainer taking over read the horse's education in order.
Build health records at the horse's pace
Health entries for a newly adopted Mustang may start sparse, and the record should say so honestly. Note what veterinary care is documented from holding, what your own vet manages at the first visit, and anything deferred because the horse was not yet handleable enough for it to be done safely, such as dental work or vaccinations handled through a chute. Farrier notes deserve the same honesty: first trims on a wary Mustang are milestones, so record how the feet were managed and how the horse coped. If a Mustang loses weight unexpectedly, shows a dull coat and tucked-up look, or a lameness appears as work begins, contact your vet and bring the diary, because the handling history often explains what examination is realistic and how it should be approached.
Log feeding, feet and ground skills together
Feeding records for a Mustang should track the change from holding rations to your forage, quantities as fed, body condition by feel and photo, and how the horse competes or settles at feeding time. Many Mustangs arrive as easy keepers shaped by sparse range, so condition can climb quickly on richer keep, and your written record catches that drift earlier than the eye does. Combine feed entries with hoof growth, trim intervals and the groundwork log: yielding to pressure, loading into a trailer, standing for fly spray or a hose. Each skill signed off in the diary widens what vets, farriers and carriers can safely do with this horse, and the record of those skills is part of the Mustang's value to any future owner.
Protect the file like the horse's passport through life
Close the record with the practical handover page: feeding routine, handling approach that works, warnings about what still frightens this Mustang, and emergency contacts. Keep adoption documents, brand photos, vet pages and the training diary in one order, updated whenever a milestone lands or a professional visits. A Mustang may move homes more than once in a long life, and a complete, honest file is the difference between the next owner continuing the work and starting again from nothing. Gathered into the KinsLe Pet Passport, that Mustang history travels as one packet, papers and progress together, wherever the horse goes next.