Peptides for kissing spine: what is known?

Does an X-ray prove my horse has kissing spine?

No. An X-ray shows bone, and it cannot tell you whether those bones are causing pain. Kissing spine means the bony tops of the spine sit close, touch or overlap, most often in the middle of the back under the saddle. A 2025 review reports these changes in up to 92% of horses in X-ray and post-mortem studies, and many of those horses show no signs at all.

That matters for two reasons. A horse with a worrying X-ray may have a different problem, such as hind limb lameness. And an X-ray alone is a weak basis for big decisions, like surgery or walking away from a sale. The review found no agreed way to grade the images, so ask your vet what the changes mean for this horse. Our kissing spine page has a short summary.

How does a vet work out whether the back is the problem?

A good workup looks at the whole horse before the back gets the blame. The steps below follow the 2025 review.

• Rule out lameness and other causes of poor performance first
• Look at posture and muscling, then feel and gently move the back
• Watch the horse walk, trot, lunge and canter on different surfaces
• Watch it ridden, if that is safe for horse and rider
• Take X-rays, and sometimes use ultrasound or a bone scan, and read them alongside the exam
• Sometimes numb the sore spaces with local anesthetic to see if the horse moves better. Results can be hard to read, and surveys show it is not used often.

Does saddle fit matter?

Yes, so have it checked early. The review discusses a poor fit as a possible cause of trauma to the back. In a study of 63 sports horses, back width increased after ridden work, but this change was smaller in ill-fitting saddles. The authors said fit should be assessed before and after exercise. They also noted that saddle fit advice has often been based on experience more than research, so a good fitter and a vet working together is a sensible approach.

Look for signs such as a horse that dislikes being tacked up or mounted, or a change in behavior under saddle. Those signs can also come from ulcers or lameness, which is one more reason to have the full workup.

What do vets usually do first?

Most start without surgery. In a 2024 survey of 353 equine orthopedic specialists, 71% preferred conservative care and kept surgery for horses that did not respond. The most popular combination was local injection plus controlled exercise.

In a survey of 97 US equine vets, 95% recommended rehabilitation exercises, and 82% reported some improvement with rehab alone. Corticosteroid was the most common injection. Rehab usually means core strengthening: dynamic mobilization, elastic bands and sometimes an underwater treadmill. Shockwave, laser and acupuncture are also used, but the 2025 review found that many studies of these are small, short or lack a placebo group. Treatment choices still rest heavily on the vet's experience, and specialists in different countries choose differently.

When is surgery considered?

Usually after other care has failed, and it comes with follow-up work. The two main routes are cutting the ligament between the bones, often with the horse standing, or removing the tops of the touching bones.

Reported results look good, but read them with care. One study found long-term success in 95% of surgical cases against 46% of medical cases, but horses were not randomly assigned. The review found only one surgical study with a matched comparison group for long-term follow-up. In the US survey, some vets saw many horses need more treatment after surgery. Ask your vet what rehab comes after, and how long it takes.

What is known about peptides for kissing spine?

Nothing in horses. Owners ask about BPC-157 and TB-500 because they are sold for tissue repair. Neither is officially tested in horses, and neither is FDA-approved for animals. No clinical trial of either in horses appears in PubMed, and BPC-157 returns no PubMed results at all for horses. We found no study of any peptide for kissing spine in horses.

There is also a practical problem. Vets manage kissing spine through posture, muscle, work and tack. No vial replaces the weeks of work that build the muscles along the back, or changes a saddle that pinches.

Competition horses should not have any peptide. The FEI bans TB-500, and BPC-157 is not cleared by being left off the list. If you are still weighing it up, read what is known about safety and talk to your vet first.

When to see a vet, and what to ask

Book a vet if your horse has a new dislike of tacking up, bucks or rears under saddle, or resents being groomed along the back. A video call with a licensed vet can help you plan what to tell your own vet. See your vet the same day if your horse is suddenly in severe pain, weak behind or wobbly, because that may be more than a sore back. Then ask:

• Have we ruled out lameness, ulcers and other causes?
• Do the X-ray changes match where this horse is sore?
• Can you and my saddle fitter look at the saddle together?
• What rehab plan should I follow, and how will we measure progress?
• If surgery comes up, what does the evidence show, and what comes after?