Arthritis in Older Cats: Signs, X-Rays, and Safe Pain Relief

A cat that stops jumping onto the sofa is usually not slowing down with age. It is protecting a painful joint. Degenerative joint disease is one of the most common findings in cats over 10 and one of the most under-treated, because cats do not limp the way dogs do. They stop doing things. The result is a cat that gets labelled lazy or grumpy for two years before anyone examines the hips.

Why cats hide it so well

Cats are light, flexible, and prey animals. A sore hip shows up as a slightly shorter stride, a preference for the floor, and reluctance at the top of a jump rather than a visible limp. They also rest more, which reads as normal aging. By the time a cat is 12, some degree of joint change on X-ray is common in the hips, knees, elbows, and spine; the spine is involved often enough that a cat can look stiff in the back legs with perfectly normal hips.

Body condition matters as much as age. Every extra 500 g on a 4 kg cat is roughly 12 percent more load through the joints, and overweight cats develop arthritis younger and worse. Weight work is covered in obesity and weight loss.

What the cat actually stops doing

Ask about function, not about pain. A useful set of questions:

• Does the cat still jump to the height it used to, or does it now climb via the chair in two stages?
• Does it hesitate before jumping down, or land heavily?
• Is it urinating just outside the box, or standing in the box rather than squatting?
• Has grooming dropped off, with matting over the lower back and base of the tail?
• Is it sleeping more, hiding, or swiping when the sore hip is touched?

Two of those together in a cat over 10 are enough to justify an exam. A cat urinating outside the box is often a litter box problem as much as a joint problem, and the fixes overlap; see litter box setup.

X-rays show damage, not pain

Radiographs are useful for ruling out fractures, tumors, and infection, and for seeing how much new bone has formed. They are poor at measuring pain. A cat with dramatic spurring on the hips can move comfortably, and a cat with mild changes can be miserable. Sedation is often needed for good views of a sore cat, which adds cost and risk, so vets increasingly treat the exam and the history as the primary evidence and use imaging to rule things out.

The stronger test is a therapeutic trial: 2 to 4 weeks of appropriate analgesia, then the same questions asked again. If jumping height, litter habits, and activity improve, the diagnosis is supported. Improvement is the evidence, and it costs far less than a full radiographic series.

The painkiller list is short, and the toxic list is long

Cats lack the liver enzymes needed to clear most NSAIDs, so the safe options are few and the doses are small. Meloxicam is the NSAID most often used, frequently off-label for long-term pain in countries where the label covers only short courses. A common maintenance range is 0.02 to 0.03 mg per kg once daily or every other day, after baseline blood work. It requires creatinine, SDMA, and liver values before starting and again at 2 to 4 weeks and then every 6 to 12 months, because the kidneys are the organ at risk. Never give meloxicam with another NSAID, and never give it to a dehydrated cat.

Also used, in different roles: frunevetmab, a monthly injection that targets nerve growth factor and is licensed for feline osteoarthritis in several countries; gabapentin at roughly 5 to 10 mg per kg twice daily for nerve-related pain, which also sedates; and amantadine or tramadol in selected cases. All of these are prescription decisions, not owner decisions.

Two human drugs are lethal at household doses. A single 325 mg acetaminophen tablet can kill a cat by destroying red blood cells and the liver, and one 200 mg ibuprofen tablet can cause acute kidney failure. Never give aspirin on a routine basis either; the safe interval is measured in days and the margin is narrow. If a cat has swallowed any of these, call a vet or poison service immediately and bring the packet.

Supplements: weak evidence, low risk

Glucosamine and chondroitin are widely sold for cats and widely used, but the evidence in cats is thin: most trials are small, short, and in dogs. They are not harmful at typical doses, and owners often report improvement, though a placebo response is likely part of it. Omega-3 fatty acids from fish oil have slightly better support for joint comfort and are usually dosed at 100 to 300 mg of combined EPA and DHA per day, introduced slowly to avoid loose stool. Green-lipped mussel products sit in the same category. None of these replace analgesia in a cat that is clearly painful.

What changes the outcome most: the house

Environment changes work within days, cost little, and do not touch the kidneys. The highest-yield list:

Change	Target
Litter box	Rim under 5 cm, at least one per floor the cat uses, unscented fine litter
Steps and ramps	Onto the bed and sofa, 30 to 40 degree slope, carpeted surface
Heated bed	Around 30 degrees Celsius, with a chew-proof cord, in a draft-free corner
Food and water	Raised 5 to 10 cm so the cat does not reach down
Scratching post	Sisal, tall enough to stretch fully, placed flat on the floor

Add nonslip runners on hard floors and a low-sided bed. For a fuller list of senior adjustments, see senior cat care.

Measure pain once a month

Pain that is not measured gets missed. Pick six questions from the list above, score each from 0 to 3, and repeat on the same day each month. A rise of 2 or more points, or any new litter box accident, is a reason to call. The same score tells you whether a dose change helped, which is more reliable than memory.

Also worth knowing: arthritis rarely travels alone. Dental disease, chronic kidney disease (CKD), and hyperthyroidism cluster in the same age group, and each one changes what can safely be prescribed. That is why the first visit for a stiff cat should include blood work and a look in the mouth, not just a prescription.

Frequently asked