Osteoarthritis is slow.That's both a challenge and an opportunity. For more about joint and mobility health, see our detailed guide. It develops over months and years, which means owners often attribute the earliest signs to "getting older" — and by the time they're clearly visible, the condition is already well-established. But that same slowness means there's time to intervene, manage it well, and give a pet years more of comfortable life.
I've been managing arthritis in dogs and cats long enough to know that the animals who do best aren't necessarily the ones with the mildest disease. They're the ones whose owners recognized the early signs, worked through the diagnostic process, and committed to consistent multimodal management. This guide covers each of those pieces.
Arthritis vs. Osteoarthritis: What We're Actually Talking About
"Arthritis" literally means joint inflammation, which covers a range of conditions. When most people — and most veterinary guides — discuss arthritis in pets, they mean osteoarthritis (OA), also called degenerative joint disease (DJD). OA is characterized by the breakdown of articular cartilage, remodeling of the underlying bone, inflammation of the joint capsule, and the development of osteophytes (bone spurs) at joint margins.
It's distinct from inflammatory arthritis (immune-mediated polyarthritis, infectious arthritis), which has different causes and requires different treatment. The distinction matters diagnostically.
OA is progressive — the joint changes don't reverse. Management aims to slow progression, control pain, and maintain function. Cure is not currently achievable.
How Common Is It, Really?
More common than most owners expect. In dogs, radiographic evidence of OA is found in the majority of dogs over eight years old — and clinical signs begin showing up meaningfully by middle age in larger breeds. Estimates from referral data range up to 80% prevalence in dogs over 8 years, though a 2024 prospective study found joint-specific prevalence ranging from 36–57% in that age group. In cats, the numbers are striking: a landmark cross-sectional study of 100 cats over 12 years old found that 90% had radiographic evidence of degenerative joint disease — yet only 4% had any record of arthritis in their clinical history. Yet most owners of arthritic cats don't know their cat has the condition, because cats don't limp.
Recognizing Arthritis: Dogs vs. Cats
In Dogs
Dogs are more transparent about pain than cats. The signs owners typically notice:
- Stiffness after rest: the dog gets up slowly, hobbles for a few steps, then loosens up. This classic pattern — worse after sleep, improves with movement — is a hallmark of OA.
- Reduced exercise tolerance: shorter walks before the dog lags or wants to stop; fatigue on terrain that was previously easy
- Reluctance to climb: stairs, into the car, onto furniture
- Changed gait: subtle shifts in how weight is distributed, one leg slightly lifted or not tracking normally
- Muscle wasting: visible decrease in muscle mass over the hindquarters or affected limb
- Behavioral changes: grumpiness, avoidance of being touched around affected joints, snapping when handled
- Licking or chewing at joints: some arthritic dogs direct oral attention to painful areas
Understanding the subtle signs of arthritis that dog owners most often miss is worth reading in full — the early signs are genuinely easy to overlook.
In Cats
A cat with severe bilateral hip OA may walk so smoothly you'd never suspect it. Cats compensate brilliantly. The signs to watch for are behavioral:
- Not jumping: to surfaces previously used without issue — the counter, the windowsill, the favorite chair. The cat may stop trying, or may choose an intermediate "stepping stone" route.
- Landing awkwardly: descending in stages rather than leaping down; jumping up in two steps where one sufficed before
- Reduced grooming: particularly over the back, base of tail, and hindquarters — too painful to reach and twist toward. The coat in these areas becomes matted or unkempt first.
- Eliminating outside the litter box: climbing in and out of a standard-height litter box becomes painful
- Withdrawal: seeking quiet spots, avoiding high-traffic areas, less interaction with family
- Irritability when touched: particularly around the spine, hips, and hind legs
A cat that used to greet you at the door and now stays in a corner deserves an orthopedic evaluation, not just a shrug about "old cat behavior."
Diagnosing Arthritis in Pets
Step 1: Clinical History
Your vet wants to know when signs started, how they've progressed, which activities are affected, time of day when symptoms are worst, and whether there are fluctuations (worse in cold weather is classic for OA). Bring video of your pet moving if the lameness is intermittent — many arthritic animals move relatively normally in the exam room with an adrenaline boost.
Step 2: Orthopedic Examination
A systematic examination of every joint — assessing range of motion, pain response, effusion (joint fluid), crepitus (grinding), and muscle mass — identifies which joints are affected and how severely. An experienced examiner can often localize the pain accurately from physical examination alone.
Step 3: Radiographs (X-rays)
X-rays confirm the diagnosis and assess severity. Changes seen in OA:
- Osteophytes: bone spurs at joint margins, the most consistent finding
- Joint space narrowing: as cartilage is lost, the visible space between bones on X-ray decreases
- Subchondral bone changes: sclerosis (bone thickening) or erosion in severe disease
- Soft tissue swelling around the joint
One important nuance: the severity of radiographic changes doesn't always match the degree of clinical pain. Some dogs with dramatic X-ray changes seem relatively comfortable; others with milder changes are significantly painful. Both the imaging and the clinical signs matter.
Additional Diagnostics When Needed
- Joint fluid analysis: if inflammatory arthritis is suspected — high white cell counts suggest immune-mediated or infectious disease, not simple OA
- Blood panel and tick-borne disease screening: immune-mediated polyarthritis and tick-borne arthritis can both mimic OA
- CT or MRI: for complex joints (elbows), pre-surgical planning, or when soft tissue assessment matters
Pain Management: The Core of OA Treatment
Getting pain under control is the foundation on which everything else rests. A pet in constant pain doesn't exercise, which worsens muscle wasting, which worsens joint loading, which worsens pain. Breaking that cycle requires effective analgesia.
NSAIDs
Non-steroidal anti-inflammatory drugs are first-line for dogs with OA. They reduce prostaglandin-mediated inflammation and are highly effective for most patients. Key points:
- Multiple formulations are available; what works best varies somewhat by individual — it's reasonable to try a different NSAID if the first isn't providing adequate relief
- Require baseline bloodwork before starting and rechecks every 6-12 months during chronic use
- Should not be combined with corticosteroids (dramatically increased GI and renal risk)
- Should not be given with other NSAIDs, including over-the-counter human formulations — this is a genuine toxicity risk
In cats, NSAID use is more complicated. Cats metabolize many drugs differently, and what's safe for dogs can be toxic for cats. There are veterinary-approved NSAID options for cats, but doses, formulations, and monitoring requirements are stricter. Never give a dog NSAID to a cat.
Anti-NGF Monoclonal Antibodies
A newer class of injectable medication targets nerve growth factor, a key mediator of chronic OA pain. Monthly or bimonthly injections have shown meaningful efficacy in both dogs and cats in randomized, placebo-controlled trials — bedinvetmab (dogs) and frunevetmab (cats) are licensed formulations with published evidence of significant pain reduction and quality-of-life improvement. They offer a non-NSAID option for animals where NSAIDs are contraindicated (kidney disease, GI sensitivity) and can be combined with NSAIDs for additive effect. This is one of the most significant advances in veterinary pain management in recent years.
Gabapentin
An anticonvulsant drug that modulates neuropathic pain — the "wind-up" pain amplification that occurs in chronic OA. Often used in combination with NSAIDs rather than as a standalone, particularly in animals with severe or long-standing disease.
Amantadine
An NMDA receptor antagonist that addresses central pain sensitization. Used in refractory cases, typically in combination with other analgesics.
Corticosteroids
Used more selectively for OA — short courses to break a pain cycle, or when inflammatory arthritis is part of the picture. Not recommended for long-term OA management due to effects on cartilage, muscle, and metabolic function.
The Weight Management Conversation
The connection between excess weight and accelerated joint disease is not subtle — it's one of the most powerful modifiable factors in OA management.
Every kilogram of excess body weight translates into several kilograms of additional force across load-bearing joints with each step. Body condition scoring (assessing whether your pet is lean, ideal, overweight, or obese) is part of every OA management plan. In overweight arthritic dogs, achieving an ideal body condition score is often more effective than any single medication.
For cats, the picture is more complex — overweight cats have OA risk, but weight loss in cats must be carefully managed to avoid hepatic lipidosis. Your vet will advise on a safe rate of weight reduction.
Exercise and Rehabilitation
Appropriate exercise is essential, not optional. The instinct to rest an arthritic pet completely is well-intentioned but counterproductive — rest causes muscle atrophy, and muscles are essential for joint stabilization and load distribution.
What appropriate exercise means in practice:
- Regular, moderate-duration activity rather than occasional intense outings. A 20-minute walk daily beats a two-hour hike on weekends for an arthritic dog.
- Low-impact activity: flat surfaces, avoiding hard stops and starts, no jumping or rough play
- Hydrotherapy: underwater treadmill or controlled swimming dramatically reduces joint loading while maintaining cardiovascular fitness and muscle mass. Excellent for post-surgical patients and those with severe OA.
- Physiotherapy exercises: specific muscle-strengthening exercises, balance work, range-of-motion exercises — performed with guidance from a veterinary rehabilitation practitioner
Home Modifications
Simple environmental changes reduce daily pain and help arthritic pets maintain independence:
- Orthopedic bedding: memory foam or orthopaedic foam provides joint cushioning; ensure multiple beds in locations the pet already uses
- Non-slip flooring: arthritic pets slip on polished floors, which is both painful and frightening. Rubber-backed rugs or yoga mat strips along regular routes make a visible difference.
- Ramps: for car access, furniture access, or any height change the pet uses regularly
- Raised bowls: reduce neck flexion in dogs with cervical or shoulder OA
- Warmth: arthritic joints are worse in cold; ensuring access to warm resting spots matters, especially in winter
- Low-sided litter boxes for cats: essential for litter box compliance in cats with arthritic hips or hips
- Ramps to favorite resting spots for cats: to windowsills, beds, sofas
Monitoring and Long-Term Care
OA is a lifelong condition. Management needs include:
- Regular rechecks: typically every 3-6 months to assess pain levels, mobility, and medication efficacy
- Routine bloodwork: for pets on long-term NSAIDs
- Reassessment as disease progresses: the management plan that works well at moderate disease may need adjustment as the condition advances
- Body weight monitoring: regular weigh-ins to catch weight gain before it significantly worsens joint loading
Keeping a simple diary of daily signs — how stiff was the dog this morning, did the cat use the high windowsill, did they play or sleep all day — provides objective data for vet visits and helps track trends.
Frequently Asked Questions
Is arthritis painful all the time, or does it fluctuate?
Both. Chronic OA pain is often continuous at some level, but it fluctuates — worse in cold weather, worse after periods of rest, worse after unusual activity, worse when weather changes rapidly. "Good days and bad days" are characteristic of OA rather than a sign that the condition is resolving on good days.
Can I give my dog anti-inflammatory medication I have at home?
Many common human pain medications — aspirin, ibuprofen, naproxen, acetaminophen — are toxic to dogs and cats. Ibuprofen and naproxen cause severe GI ulceration and kidney failure. Acetaminophen is life-threateningly toxic to cats. Never give human pain medication to your pet without explicit guidance from your vet.
How do I know if the pain medication is working?
Improved spontaneous activity (moving more voluntarily), less stiffness after rest, willingness to engage in activities previously avoided, better sleep, and improved demeanor are all indicators. Pain scales exist for dogs that owners can use to track changes objectively — your vet can guide you on these tools. For cats, increased jumping, grooming, and social interaction are reliable positive indicators.
Should I consider surgery for my arthritic pet?
It depends on the underlying cause and severity. For end-stage hip OA, total hip replacement gives excellent outcomes in appropriate candidates. For CCL rupture driving stifle OA, surgical stabilization is the standard of care and prevents further joint deterioration. For OA without a surgically correctable primary cause, surgery doesn't have a role. Your vet or a specialist can advise whether surgery is relevant for your pet's specific situation.