Cat Limping: Trauma, Arthritis and the Emergency to Rule Out

A cat does not show pain the way a person or a dog does. It does not whine, does not lick the sore spot for an audience and does not ask for help — it simply moves less. So obvious limping in a cat almost always means the pain is already severe, and a handful of less obvious changes in behaviour usually mean the pain has been there for a long time.

Sudden Hind-Limb Paralysis: Thromboembolism, Measured in Hours

Start with what cannot be watched. Aortic thromboembolism, the "saddle thrombus", is a clot from the heart blocking the artery where it divides, leaving both hind legs without blood flow at once. The picture is recognisable and develops within minutes:

• the cat cries out suddenly, collapses and cannot stand;
• the hind legs do not work: they drag, or go rigid;
• the pads are cold, and pads and nail beds look pale or blue;
• the thigh muscles feel hard and the cat will not let you touch the legs;
• breathing is fast or open-mouthed — see a cat breathing with an open mouth.

This is an emergency. Drive immediately, at night if need be, without trying to warm the legs and without giving pain relief at home. The cause is nearly always hidden heart disease, usually hypertrophic cardiomyopathy that gave no warning; once the cat is stable, echocardiography follows — the method is described in dog heart ultrasound and ECG. Sometimes only one leg is affected, and the cat limps and drags a single hind leg — same mechanism, same urgency.

Trauma: The Commonest Cause of Sudden Limping

In an outdoor cat, or one living with open windows, the first version is trauma: a sprain, dislocation, crack, fracture, torn claw or a thorn wedged between the toes. Acute trauma looks the part: the cat will not put the leg down at all, the limb hangs or turns out, and there is swelling.

How to assess at home without making it worse: examine the pads and the spaces between toes in good light, check the claws, and run a hand down the leg noting where the cat pulls away. Do not flex joints by force and do not try to reset anything. Limping after a fall from height always needs an exam even if the cat looks intact: falls in cats produce a combination of chest, palate and limb injuries.

Bites, Abscesses and Wounds Between the Toes

In outdoor cats the second commonest cause is a fight. A canine-tooth puncture closes over within a day while the infection stays inside, and two to four days later it becomes an abscess: a hot painful swelling, limping, fever and dullness. The usual organism is Pasteurella — a bacterial infection that also matters to people who get bitten. If the cat started limping days after being outdoors, look for swelling on the leg or at the tail base, and do not lance it yourself.

Arthritis in Cats: The Under-Diagnosed Cause

Here is the part owners rarely hear. Radiographic signs of degenerative joint disease are found in most cats over ten to twelve years old, yet very few are ever presented for sore joints. The reason is simple: an arthritic cat barely limps. It compensates, shifts weight and changes its habits, and the owner puts it down to age.

Look for changes, not for a limp:

• it stopped jumping onto the windowsill or sofa, or climbs in two stages;
• it goes down stairs sideways or backs down;
• it misses the litter tray because a high side has become impossible;
• the coat over the back and tail base is matted: arching to groom there hurts, see cat hair loss;
• it has become irritable, yowls at night (a cat meowing constantly), hides and plays less;
• it is stiff after sleeping and loosens up after a few steps.

Excess weight loads joints more than any other single factor, so managing arthritis starts with counting the energy in the diet — see choosing food for a cat; in older cats the whole diet is rebuilt.

What Else Causes Limping

• Claws: an ingrown claw growing into the pad in old or inactive cats.
• Pads: cuts, burns from a hob or de-icing salt, foreign bodies.
• Infectious and immune-mediated joint disease, more often in young cats, with fever.
• Bone tumours, more often in older cats: limping builds over weeks with no triggering event.
• Neurological problems: disc disease, spinal trauma, tumours — the leg is not painful, it just does not obey.

When to See a Vet Urgently

Immediately, without waiting for morning:

• both hind legs fail at once, the cat cries, and the pads are cold and pale;
• the leg hangs, is twisted, or bone is visible;
• limping after a fall from height or a road accident — even in a bright, alert cat;
• a hot painful swelling with fever and dullness — see a lethargic cat;
• the cat cannot stand at all, or cannot pass urine.

Otherwise an appointment within a day or two is right. If you are unsure, describe it in plain words and get an urgency read: the symptom review does not replace a vet, but it tells you whether to drive now or book.

What Not to Do at Home

• Do not give human painkillers. Human painkillers and fever medicines are lethal to cats, whose liver cannot neutralise these substances. Any medication, including pet-shop products, is prescribed by a veterinarian only.
• Do not warm or rub paralysed legs if thromboembolism is suspected: it speeds the return of accumulated breakdown products into the circulation.
• Do not reset a joint or bandage tightly — over a fracture a tight bandage cuts off blood supply.
• Do not lance an abscess yourself, and do not pour spirit or antiseptic dye into a wound.
• Do not make the cat walk to check whether it bears weight: rest until the exam beats any test you can run.

What Imaging and Tests Will Clarify

For limping the leading method is radiography. It shows fractures, dislocations, joint space narrowing, bony proliferation and bone tumours; how limb films are read is covered in dog leg and joint X-ray — the technique in a cat is the same. The chest is imaged after a fall from height and when metastases are suspected: cat X-ray. Where radiographs do not answer — spine, spinal cord, soft tissue — MRI and CT in dogs and cats is used. A finished report or disc is read through pet imaging interpretation.

Blood work matters in two situations: suspected joint infection or immune-mediated inflammation, and pre-anaesthetic screening. The baseline is a complete blood count and biochemistry, explained in cat blood test; a clinic form can be uploaded for pet results interpretation. Other feline signs are collected on the cat symptoms page, and in dogs limping reads differently — see dog limping.

This article is informational. Diagnosis and treatment of your pet are the job of a veterinarian.