Dog Arthritis in Back Legs: Signs, Causes and How It Is Managed

Arthritis in a dog's back legs is osteoarthritis, the breakdown and inflammation of a joint, and as dogs age it commonly leaves the back end stiff, swaying and slow to rise from lying down.¹ Yes, dogs can get arthritis in their legs, and it often follows joint problems like cruciate ligament tears in the knees or developmental conditions such as hip dysplasia.¹ The cartilage in a freely moving joint can wear down over time, which leads to loss of joint movement and, in many cases, pain, along with thinning cartilage, fluid inside the joint and bony outgrowths around it.² If you are still working out what is going on with your dog's back end, start with our overview of back leg problems in dogs, then come back here.

Why the hips, knees and lower spine are usually to blame

Most often, osteoarthritis follows another orthopedic problem: a ruptured cranial cruciate ligament (a tear in the main stabilising ligament of the knee), osteochondrosis (a fault in the way joint cartilage develops), or trauma.¹ In other dogs there is no single trigger at all, and arthritis develops from daily wear and tear on the joint.¹

Hips are the other big one. In hip dysplasia, the hip joint grows loose, and joint degeneration follows as the body tries to stabilise that loose joint.³ Hip dysplasia begins in puppyhood, but most dogs show no signs until they are older, often after years of gradual joint degeneration.³

The signs owners actually notice

A stiff hind limb gait, a waddle or sway through the body, unwillingness or inability to jump onto furniture or into the car, sitting with a leg straight out or flopped on one hip, and difficulty rising from lying down are all typical.¹ Some dogs with hip dysplasia walk with a "bunny-hopping" gait.⁴

Loss of muscle on the rear limbs and a shift of weight onto the front legs are both common signs,⁵ and in dogs with hip arthritis that shift from the back limbs to the front is measurable.⁶ Joint swelling and thickening around the joint can also occur.² Licking at a hip or knee, grumbling when touched back there and slipping on smooth floors round out the list. Wobbling in the hind end shows up too, since with conditions like degenerative myelopathy the hindquarters can appear to sway even while the dog is standing still, and we cover why arthritic back legs shake separately.⁷

How your vet tells arthritis apart from nerve problems

Your vet checks for arthritis by moving the joints to find pain, grinding and limited range of motion, watching your dog walk for a limp or stiff gait, and taking X-rays or other imaging if needed.¹ X-rays help show how much arthritis is present and guide treatment planning.⁴

In its early stages, degenerative myelopathy looks like arthritis, which makes diagnosis genuinely challenging.⁷ Later, progressive weakness and ataxia (wobbling and stumbling) separate it from hip arthritis.⁷ Degenerative myelopathy, a spinal cord disease, often causes knuckling, where the hind paws turn under so the dog walks on its knuckles, and hind feet that scrape the ground.⁷ Most dogs with it do not seem painful, just very weak.⁷ Spinal injuries, spinal tumours, lumbosacral stenosis (a narrowing of the spinal canal in the lower back) and fibrocartilaginous embolism (a blockage in one of the spinal cord's small blood vessels) can cause similar signs.⁷ If you are seeing scraped hind feet or knuckling paws in a dog you think has arthritis, tell your vet.

The management plan for a dog with arthritis in the back legs

Arthritis is managed in layers, not fixed with one thing. A slender body weight is by far the most critical part, because fat produces substances that drive inflammation and extra weight loads the joints further.¹ High-impact activity like running and jumping should be limited and replaced with controlled leash walks, since low impact, consistent exercise builds the muscle around the joints and eventually improves joint stability.¹ Rehabilitation such as range of motion work, therapeutic exercise and aqua therapy (underwater treadmill or swimming) improves joint mobility, increases muscle mass and builds endurance.¹ Your vet prescribes pain medication based on your dog's signs, age and overall health,² so that part belongs in the exam room. Our guide to treatment options goes deeper. Acupuncture, laser therapy and similar add-ons are commonly recommended, though studies proving their benefit are lacking.¹

Changes at home that make the biggest difference

Traction and effort are what you control day to day. Rugs, carpets or yoga mats on hardwood and tile, ramps or steps where needed, a sling or harness to help with standing and walking, and booties to protect scuffed paws are all standard management.⁸ Add an orthopedic bed, raised bowls, short flat outings instead of one long walk, and a coat on cold mornings. Warm compresses on sore joints and exercise on soft surfaces also help.² For home strengthening, think slow and little, and skip stair sprints, ball chasing and any forced exercise on a bad day.

When a rear support wheelchair helps an arthritic dog

A rear wheelchair helps when the back legs are still working but no longer reliable enough to hold your dog up. A wheelchair to support the hind limbs sits alongside rugs, ramps and slings on the standard list of mobility management steps.⁸ It does not treat arthritis. What it does is carry weight, prevent falls on slick floors, and let your dog keep walking and toileting on their own.

The OldPal Rear Support Dog Wheelchair comes in five sizes covering rear leg heights from 3 to 27 inches. The padded harness carries weight through the hips and chest rather than the spine, the frame is set so the back legs hang free or lightly brush the ground, and dogs can squat and go to the bathroom while in the chair. Sizing uses one measurement: rear leg height, from the top of the hip straight down to the toe pad, with your dog lying on their side and the leg at its natural bend. Take it with our measuring guide and fit finder, or email a photo and a measurement to help@oldpalpets.com and a person will check it. If the size is wrong, our Fit Guarantee lets you exchange the frame for the size that fits.

A sling is a lift you hold; a wheelchair stands on its own. Introduce wheels in short supervised sessions on flat ground, five or ten minutes at first, with treats.

Good days, bad days, and when to call the vet today

Medical treatment does not cure arthritis, but appropriate management allows most dogs to live a long, active life with good quality of life.¹ It is a progressive degenerative joint disease causing pain and reduced mobility, and while it is incurable, combining several approaches improves outcomes.⁹ Keep a simple diary: rising time, walk length, any stumbles, plus a short phone video once a week.

Call your vet the same day for sudden collapse or inability to stand, both back feet dragging, loss of bladder or bowel control, crying out, or weakness that appears overnight. Sudden paralysis is an emergency.

Frequently asked questions

Related guides

• Wheelchairs for dogs with hip dysplasia and arthritis
• Day to day care for a dog with weak back legs

Sources