How Do I Know If My Dog Has Osteoarthritis?

What happens in the body of a dog with osteoarthritis?

Osteoarthritis is not simply mechanical "wear and tear" of the joint: it is a chronic inflammatory disease that affects several joint tissues.

Dogs with osteoarthritis show increased inflammatory markers in synovial fluid, confirming the major role of inflammation in disease progression.

de Bakker et al.

1. Cartilage breakdown
   Joint cartilage acts as a shock absorber. With age, chondrocytes (cartilage cells) produce less collagen and proteoglycans—large molecules that retain water and maintain cartilage elasticity. Fewer of these cells leave the cartilage matrix drier and more fragile. The result: cartilage thins, cracks, and loses its ability to absorb impact.
2. Synovial inflammation
   Degraded cartilage fragments trigger a local immune response. The synovial membrane, which lines the inside of the joint and produces lubricating synovial fluid, becomes inflamed: this is synovitis. It then releases chemical substances called inflammatory mediators (cytokines, prostaglandins, leukotrienes) that increase pain and accelerate cartilage destruction.
3. Activation of destructive enzymes
   Certain natural enzymes, such as matrix metalloproteinases (MMPs) and aggrecanases, play a role in cartilage renewal. But in osteoarthritis, they become overactive and break down collagen and proteoglycans faster than they are produced. This imbalance accelerates cartilage destruction and feeds a vicious cycle.
4. Bone changes
   The bone beneath the cartilage (subchondral bone) reacts to this wear: it thickens in places, creating bony outgrowths called osteophytes. These "bone spurs" stiffen the joint and limit mobility.
5. Pain and loss of mobility
   The combination of inflammation, stiffness, and mechanical damage causes pain. Unlike a simple sprain, this is chronic pain that can vary in intensity but tends to worsen over time.

Early signs of osteoarthritis to watch for

• Intermittent limping, more noticeable after rest.
• Difficulty getting up after a long nap.
• Morning stiffness, which improves after a few minutes of walking.
• Reluctance to get in the car or climb stairs.
• Loss of interest in play or running.
• Behaviour change : growling or pulling away when a painful joint is touched.

These signs are sometimes mistaken for simple ageing. Yet they can indicate chronic joint pain.

In practice, only a veterinary examination can distinguish simple fatigue from early osteoarthritis.

When should you see a vet?

Home observation is essential, but only a veterinary consultation can confirm osteoarthritis. Your vet will use several methods:

• joint palpation (pain, crepitus, reduced range of motion),
• X-rays to assess cartilage condition and the presence of osteophytes,
• validated scores such as the Canine Brief Pain Inventory (CBPI), a standardised questionnaire recognised by the veterinary community. It objectively measures pain and the impact on mobility based on owner observations.

Key takeaway: if a dog limps for more than a few days, even intermittently, see a vet. Other conditions (cruciate ligament rupture, sprain, simple strain) can cause similar symptoms.

What to do if you suspect osteoarthritis

Even without a formal diagnosis, a few adjustments can help relieve your dog:

• Adapt activity : favour gentle walks, avoid jumping and intense exertion.
• Manage weight: obesity nearly doubles the risk of developing severe osteoarthritis (Marshall et al., 2010).
• Adjust the environment : non-slip mats, comfortable bedding, avoid slippery floors.

Finally, joint support through a tailored diet and natural nutrients (such as Omega-3 EPA & DHA from green lipped mussel or algae) can help limit joint inflammation.

Conclusion

Recognising osteoarthritis in dogs relies on sometimes subtle signs: intermittent limping, morning stiffness, loss of interest in play. If you suspect discomfort, a veterinary consultation is the only way to get a reliable diagnosis.

By acting early—through lifestyle adjustments, weight management, and natural joint support—it is possible to preserve your companion's mobility and quality of life.

Scientific references

• Johnston SA. Osteoarthritis – joint anatomy, physiology, and pathobiology. Veterinary Clinics of North America: Small Animal Practice. 1997;27:699–723. doi:10.1016/S0195-5616(97)50076-3.
• de Bakker E, Stroobants V, VanDael F, Ryssen BV, Meyer E. Canine synovial fluid biomarkers for early detection and monitoring of osteoarthritis. Vet Rec. 2017 Apr 1;180(13):328-329. doi:10.1136/vr.103982. PMID:28364073.
• Rialland P, Bichot S, Moreau M, Guillot M, Lussier B, Gauvin D, Martel-Pelletier J, Pelletier JP, Troncy E. Clinical validity of outcome pain measures in naturally occurring canine osteoarthritis. BMC Vet Res. 2012 Sep 10;8:162. doi:10.1186/1746-6148-8-162. PMID:22963751; PMCID:PMC3526499.

This article was written by the R&D team at Laboratoire Sensilia, experts in animal nutrition.