One thing first. If your horse still competes in anything, including local affiliated classes, cannabinoids are prohibited under USEF rules and this question may be settled before it starts.
Start with a diagnosis, and here is why that is not a formality
An older horse that has become stiff, reluctant or slower has a reason, and “old age” is not one of them.
Arthritis is common and it is treatable. Equine joint medicine has a great deal to offer, from anti-inflammatories to joint medication to structured exercise programmes. A horse in pain should have pain relief.
Laminitis and metabolic conditions present as reluctance to move. This is the clinically important paragraph on this page. Older horses have a raised risk of PPID, often called Cushing’s, and of insulin dysregulation, both of which are linked to laminitis. A horse that is reluctant to move, shifting weight, or standing oddly may be laminitic, and that is an urgent veterinary situation rather than a stiffness one.
Do not attribute a change in an older horse to age until a vet has looked at it. The conditions that present this way are the ones where early intervention matters most.
Dental and foot problems also show up as a horse that has become difficult or reluctant, and both are checkable.
What helps an arthritic older horse
Most of it is not in a bottle.
Movement. Controlled, consistent turnout and exercise. Stiff horses generally do worse standing in a stable and better moving gently and regularly.
Weight management. Excess weight loads joints and is also tied to metabolic risk. It is one of the highest-value interventions available and it costs nothing.
Foot balance and regular farriery. Underrated, and it changes how a horse loads its limbs.
Veterinary pain management. Effective, available, and appropriate for a horse that is uncomfortable.
Surface and workload adjustments. What the horse is asked to do and what it is asked to do it on.
Warmth and rugging in cold weather, which many owners find makes a visible difference to an old stiff horse.
If none of that has been addressed, a supplement is addressing the least important variable.
Where CBD might fit
Alongside that, not instead of it, and with the honest caveat that the evidence in horses is limited.
Published work on CBD in horses is considerably thinner than in dogs, and part of the reason is structural: competition rules constrain use, which constrains the population available to study.
What that means for you is that you are working with less information than a dog owner has, and considerably less than the marketing implies.
→Read nextWhat the research actually shows
The retired horse question
A lot of people ask this specifically, so it deserves a direct answer.
A genuinely retired horse that will never compete again is outside the competition rules. That is straightforward.
Two things to check before assuming it applies to you. First, whether the horse might be lent, loaned, shown in-hand or taken to anything affiliated, because plans change and horses get borrowed. Second, whether anyone else on the yard might use the horse in a way that brings it under rules.
If there is any realistic chance of the horse appearing at anything affiliated, treat the rules as applying.
The interaction question in older horses
Older horses are the most medicated horses, which makes this the population where the interaction question is least theoretical.
A horse on medication for a chronic condition, particularly a metabolic one, is a horse whose vet needs to know about anything you are adding. Bring the actual list to the conversation.
What to ask your equine vet
- “Has this horse been assessed for PPID or insulin dysregulation?” If not, ask why not.
- “Is the stiffness arthritic, and would pain relief be appropriate?”
- “Given what my horse is on, is there an interaction concern with a cannabinoid product?”
- “Does anything about this horse’s situation bring it under competition rules?”
- “Is there something that would do more for the comfort I am actually worried about?”
What we are not going to tell you
We do not make an equine product, this page has no product links, and we are not going to give you a dosing figure for a 500kg animal we do not supply.
→Read nextWhy the dosing maths does not carry over
The short version
The short version
- Do not attribute stiffness in an older horse to age until a vet has assessed it.
- Laminitis, PPID and insulin dysregulation present as reluctance to move and are urgent.
- Movement, weight, farriery and veterinary pain management do more than any supplement.
- The published evidence in horses is limited, partly because the rules constrain research.
- A genuinely retired horse is outside the competition rules. Check that it is genuinely retired.
- Older horses are the most medicated horses, which makes interactions a live question.