6 Signs of Osteoarthritis in Horses (And What to Do About Them)

Osteoarthritis in horses affects more than the joint surface: as the condition progresses, bones, cartilage, and the surrounding ligaments are all involved. It's also far more common than most owners assume. Osteoarthritic changes are already present in more than half of horses over 15, and by 30 that figure climbs to 80–90 percent [1]. Recognising the signs early is what determines how effectively the condition can be managed.

Six signs of osteoarthritis in horses

1. Reduced flexibility and stiff gait

Osteoarthritis rarely begins with overt lameness. The first sign is typically a stiff, stilted gait: your horse is slow to get moving and feels less supple under saddle. In horses with cervical osteoarthritis, flexion and lateral neck movement become visibly restricted [3].

A key observation: after 10–15 minutes of active movement, the stiffness often eases noticeably. This warm-up pattern is characteristic of early joint disease and should not be mistaken for the horse simply settling in [3]. I still see owners write this off as a horse being lazy at the start of a ride. It usually isn't.

2. Difficulty rolling and rising

Watch for a horse that rolls less than usual or struggles to stand up from lying down. When osteoarthritis affects the vertebral column, these movements become effortful and uncomfortable. Reduced rolling frequency is an early sign that is easily overlooked [3].

3. Resistance and evasion under saddle

Activities that compress or torque an affected joint, such as jumping, tight turns, and lateral work, can trigger sharp pain. Signs include hollowing the back, tail-swishing, reluctance to canter, or outright refusal of exercises that were previously straightforward. These are pain responses, not training failures [4].

4. Lameness, most apparent on circles

Asymmetric joint loading produces lameness that is often more visible on a small circle than in straight-line work. In forelimb lameness, head-nodding at the trot, where the horse drops its head as the sound limb lands, is a classic evaluator sign [5].

5. Irritability and behavioural changes

Chronic pain alters behaviour. A horse in ongoing discomfort may pin its ears, swish the tail, bite, kick, or become intolerant of grooming around the affected area. A horse that has become generally difficult to handle without another clear explanation warrants a veterinary lameness evaluation [4].

6. Difficulty chewing (quidding)

If your horse drops food, chews asymmetrically, or favours one side of the mouth, the temporomandibular joint may be involved. These signs overlap with dental problems, so a veterinary examination is required to distinguish the cause [3].