What Is Osteoarthritis in Dogs?
Osteoarthritis (OA), also called degenerative joint disease, is a progressive condition in which the cartilage that cushions the joints breaks down over time. As cartilage deteriorates, the underlying bone is exposed and the body's inflammatory response causes pain, swelling, and changes to the joint structure. New bone may form around the edges of the joint (osteophytes), further restricting movement and causing discomfort. It is important to understand that osteoarthritis is not simply "wear and tear" that should be accepted as an inevitable part of ageing — it is a painful medical condition that responds well to treatment, and dogs that are not treated suffer needlessly.
Estimates suggest that up to four in five dogs over the age of eight years are affected by osteoarthritis to some degree. Many cases go undiagnosed because the signs are subtle and because dogs tend to adapt their behaviour to avoid pain rather than vocalising it. If you have a senior dog, it is worth discussing arthritis screening with your vet even if your dog appears to be moving well.
Recognising the Signs of Arthritis
The signs of arthritis in dogs are often gradual and easy to attribute to normal ageing. Key things to look for include:
- Reluctance to rise from rest, particularly after sleeping.
- Stiffness that improves after a few minutes of movement but worsens again after prolonged activity.
- Lameness or favouring one or more limbs, which may be intermittent or persistent.
- Difficulty navigating stairs, jumping into the car, or getting onto furniture they previously accessed easily.
- Reduced enthusiasm for walks or play, or tiring more quickly than before.
- Muscle wasting, particularly over the hindquarters and thighs, due to reduced use of painful limbs.
- Behavioural changes — grumpiness, irritability, reluctance to be touched in certain areas, or snapping when handled. These responses are pain-driven, not temperament problems.
- Licking or chewing at specific joints.
If you notice any of these signs, arrange a veterinary examination. Do not wait to see if things improve on their own — arthritis is a progressive condition that worsens without management.
Diagnosis
A diagnosis of osteoarthritis is typically made through a combination of a thorough physical and orthopaedic examination and X-rays. Your vet will assess your dog's gait, palpate each joint for pain, swelling, or reduced range of motion, and observe the dog's movement. X-rays can confirm joint changes including reduced joint space, osteophyte formation, and bone remodelling, though it is worth noting that the degree of radiographic change does not always correlate directly with the level of pain — some dogs with severe changes on X-ray appear comfortable, while others with mild changes may be significantly painful.
Weight Management: The Most Important Intervention
If your arthritic dog is overweight, weight loss is the single most impactful thing you can do to reduce pain and improve mobility. Every kilogram of excess weight places disproportionate additional load on joints with every step. Research has demonstrated that even a 5 to 10 per cent reduction in body weight produces a meaningful decrease in lameness and pain scores in arthritic dogs. Weight loss reduces the mechanical load on joints, decreases circulating inflammatory mediators produced by fat tissue, and can reduce the dose of pain medication required.
Your vet can assess your dog's body condition score and advise on an appropriate weight loss diet and target. Prescription weight loss diets are particularly useful because they are calorie-controlled while remaining nutritionally complete and satisfying. Weight management should be considered not an optional add-on but a core part of arthritis treatment.
Exercise Modification
Appropriate exercise is important for arthritic dogs — complete rest allows muscles to weaken and joints to stiffen further. The key is to avoid the "boom-bust" pattern that many dogs fall into, where they are sedentary for most of the week and then undergo a long walk at the weekend, which causes significant pain and inflammation. Instead, aim for shorter, more frequent walks at a steady, comfortable pace. Gentle movement little and often is far preferable to infrequent intense exercise. Swimming and hydrotherapy are excellent for arthritic dogs because the buoyancy of water supports the body weight and allows movement without joint loading.
Physiotherapy and Hydrotherapy
Veterinary physiotherapy has a growing evidence base for improving mobility, reducing pain, and maintaining muscle mass in dogs with osteoarthritis. Physiotherapists use a range of techniques including massage, passive range of motion exercises, therapeutic ultrasound, laser therapy, and tailored exercise programmes. In the UK, look for physiotherapists accredited by ACPAT (Association of Chartered Physiotherapists in Animal Therapy), who have completed recognised post-graduate training in animal physiotherapy. Hydrotherapy — either swimming in a pool or walking on an underwater treadmill — provides low-impact exercise that builds muscle and improves joint mobility without placing stress on painful joints.
Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)
NSAIDs are the most commonly prescribed class of medication for canine osteoarthritis. They reduce inflammation and pain and can produce significant improvements in quality of life. Commonly used NSAIDs in dogs include meloxicam, carprofen, and grapiprant, the latter having a more targeted mechanism that may suit dogs that do not tolerate traditional NSAIDs well. NSAIDs are prescription-only medications and must only be used under veterinary supervision. Long-term use requires regular blood monitoring (typically every six months) to check for effects on kidney and liver function. NSAIDs should never be combined with each other or with corticosteroids, and you should always inform your vet of any other medications or supplements your dog is receiving.
Adjunct Supplements
Several nutritional supplements have evidence of benefit in canine osteoarthritis, though none replaces veterinary-prescribed medication for moderate to severe disease:
- Omega-3 fatty acids (EPA and DHA from fish oil) — have the best evidence base of any supplement for canine joint disease. They have genuine anti-inflammatory properties and have been shown to reduce the required dose of NSAIDs in some dogs. Dose matters: therapeutic doses are higher than those found in standard pet foods.
- Glucosamine and chondroitin — moderate evidence of benefit, with studies showing modest improvements in mobility and pain scores. They are very safe to use and many owners report positive effects.
- Green-lipped mussel — contains a unique profile of omega-3 fatty acids and glycosaminoglycans and has some positive clinical evidence in dogs. Available as a powder, capsule, or incorporated into joint supplements.
Newer Treatments: Joint Injections and Monoclonal Antibody Therapy
For dogs that do not respond adequately to NSAIDs alone, additional options are available. Intra-articular corticosteroid injections can provide significant short-term pain relief in specific joints and are a useful tool when one or two joints are causing the most problems. Librela (bedinvetmab) is a monoclonal antibody therapy for dogs that was approved in the EU and UK in recent years. It works by targeting nerve growth factor (NGF), a key pain signalling molecule in osteoarthritis, blocking pain signals at their source. It is given as a monthly injection by a vet and has shown significant efficacy in clinical trials. It offers a useful option for dogs that cannot tolerate NSAIDs or need additional pain control beyond what NSAIDs provide.
Adapting Your Home Environment
Simple modifications at home can make a significant difference to the daily comfort of an arthritic dog:
- Provide a supportive orthopaedic bed with memory foam to cushion painful joints during rest. Place it somewhere warm and away from draughts.
- Use ramps or steps to allow access to sofas, beds, or the car without jumping.
- Place non-slip mats or rugs on smooth floors throughout the home. Slipping on hard floors is both painful and frightening for arthritic dogs.
- Raise food and water bowls to reduce the need to lower the head and neck, which can be uncomfortable for dogs with neck or thoracic spine arthritis.
- Ensure the dog does not have to navigate stairs unnecessarily — set up a comfortable space on the ground floor if stairs are a regular challenge.
Regular Reassessment and Pain Scoring
Arthritis management is not a one-time intervention but an ongoing process that requires regular reassessment as the condition evolves. Pain scoring tools such as the Helsinki Chronic Pain Index or the Canine Brief Pain Inventory can help owners and vets track changes in pain and mobility over time in a structured way. These questionnaire-based tools ask owners to rate their dog's pain and function across a range of daily activities and provide a numerical score that can be compared between visits. Regular check-ins with your vet — every three to six months for a stable arthritic dog — allow treatment to be adjusted as needed to maintain the best possible quality of life.