Dog's Back Legs Giving Out: Causes, Red Flags and What Helps

If your dog's back legs are giving out, common causes include arthritis that often follows hip dysplasia (poorly fitting hip joints) in large breeds, spinal problems such as injuries, tumors, or lumbosacral stenosis (narrowing of the lower spine), and degenerative myelopathy, a slowly progressive disease of the spinal cord in middle-aged to older dogs like German shepherds.¹ Sudden inability to walk is an emergency, but a gradual wobble usually means a regular appointment, a plan, and a lot of practical support at home.

This guide walks through what is most likely, how to read the clues yourself, what the vet visit involves, and what actually helps day to day. For the wider picture of everything that can go wrong in the back end, start with our overview of back leg problems in dogs.

Why do dogs' back legs give out?

Arthritis and hip pain. Arthritis, which often develops secondary to hip dysplasia in many large breed dogs, is a common everyday explanation for these signs, and in the early stages it can look so much like nerve disease that telling them apart is challenging.¹

Intervertebral disc disease (IVDD). This happens when the disc that sits between two vertebrae to cushion movement in the spine deteriorates and presses on the spinal cord.² Dogs with IVDD may limp, drag their legs, or hunch their back.³ Type I disc disease, a rupture, is very common, especially among dachshunds, French bulldogs, beagles, and Shih Tzus,² while Type II, a slower bulging of the disc, is more common in larger breeds.² Both types compress the spinal cord and can occur in any dog.²

Degenerative myelopathy (DM). This is a disease of the spinal cord itself, causing gradual paralysis that starts in the hind legs and moves forward.⁴ It typically starts between 8 and 14 years of age⁵ and is seen in middle-aged to older dogs including German shepherds, huskies and collies,¹ with boxers, corgis, Bernese mountain dogs, golden retrievers, Rhodesian ridgebacks and many others also at risk.¹ If you have a boxer, we have a separate guide on weak back legs in boxers.

Other spinal causes. Spinal injuries, spinal tumors, lumbosacral stenosis, fibrocartilaginous embolism (a blockage affecting the spinal cord), myasthenia gravis (a disorder of the signal from nerve to muscle) and discospondylitis (infection in the spine) can all produce the same picture.¹ This is exactly why "back legs giving out" is a symptom to investigate, not a verdict.

Muscle loss. With degenerative myelopathy, the hind limbs gradually waste away as they lose coordination and use, which is why physical therapy to help maintain muscle mass is a standard part of management.⁶ Physical therapy has been shown to slow progression, prolong quality of life and preserve muscle mass, so any dog with DM should be kept as physically active as possible for as long as possible.¹

Is it pain or nerves? Reading the clues at home

Arthritis in the hips and degenerative myelopathy look alike early on, but a dog with this spinal cord disease usually is not in pain and instead wobbles and stumbles as the weakness progresses.¹

Signs that point toward the nerves and spinal cord:

• The hind paws knuckle or turn under so the dog walks on its knuckles, especially when turning.¹
• The hind feet scrape the ground when walking, and sometimes the top of the feet become hairless and irritated from repeated trauma.¹ Scuffed toenails on the hind limbs are one of the clinical signs of degenerative myelopathy.⁶
• The hindquarters appear to sway when the dog is standing still, and the dog falls over easily when pushed from the side.¹
• Early signs can be subtle: dragging a rear foot, a wobbly gait, or taking a wrong step here and there.⁴
• Signs often start in one hind limb and then progress to include both.⁶

Signs that point toward pain: a sudden cry while playing or jumping, an arched back like a cat, refusing food, and avoiding jumping onto the sofa or other furniture they normally use.³ A dog can be playing one moment and suddenly cry out, because the force of the movement can damage a disc, causing acute pain and pressure on the spinal cord.³ Arching the back like a cat, looking drunk while walking, or struggling to get into position to poop all fit the disc picture.³

One more distinction matters. Most dogs with degenerative myelopathy do not seem in pain, just very weak,¹ and an important feature of the disease is that it is not painful.⁵ So a yelp or other sign of pain suggests another condition, such as arthritis, is complicating things.¹ If the wobble only shows up after a few minutes of movement, see our guide on back legs that give out during a walk.

Sudden collapse versus slow decline

How fast it came on decides how fast you move.

Go now, today, if:

• Your dog cannot walk at all. The symptom that is an absolute emergency is if the dog is unable to walk.³
• There is complete loss of use of the back end, which can mean complete compression of the spinal cord and requires immediate veterinary care.³
• The dog is paralyzed and cannot feel the feet, which is an emergency and carries a very low chance of walking again even with surgery.²
• Your dog has not peed in 24 hours, which can be a medical emergency.⁴
• There has been a fall or other trauma. Dogs that fall down stairs can show spinal cord signs ranging from mild weakness to full hind-end paralysis.⁷
• Your dog is crying in pain, or the weakness comes with vomiting, a swollen belly, pale gums, heat exposure, or a refusal to eat. Those combinations need a phone call now. We cover two of them in more detail in the guides on weak back legs with vomiting and weak back legs with a dog who won't eat.

Book a normal appointment, soon, if: the change has crept in over weeks or months, your dog is still walking, still eating, still happy, and there is no obvious pain. That is the typical picture of degenerative myelopathy, which usually begins between 8 and 14 years of age with loss of coordination in the hind legs and gradually worsens over six months to a year into paralysis of the hind legs.⁵ Do not wait it out indefinitely, though. As one veterinarian puts it, the one thing you cannot do is ignore it, because a minor problem that could be fixed with rest and medication can become a much more serious problem if it is not paid attention to.³

"Just old age" is not a diagnosis: the vet visit

Roger Clemmons notes, only about 25% of German Shepherd Dogs showing these signs actually have degenerative myelopathy while the others may have a potentially treatable disease.⁴ Hold onto that line the next time someone tells you it is just age.

Bring three things: a video of your dog walking away from the camera on a flat, non-slip surface, a short timeline of when you first noticed each sign, and a note of anything that makes it better or worse. Small changes are hard to describe from memory and easy to see on film.

At the visit, expect a neurologic examination, a hands-on check of nerves and reflexes, which is the first step whatever the severity of the signs.² From there, testing may include blood work, X-rays, MRI or CT, and analysis of the fluid around the spinal cord.⁶ Spinal imaging is usually done in the early stages to rule out other problems such as hip dysplasia and chronic arthritis.¹ X-rays have limits, though: they confirm IVDD only 60 percent of the time, so MRI or CT are preferred for this disease.²

Degenerative myelopathy is different, since no test can confirm it in a living dog, so vets run those same tests to rule out other spinal cord diseases.⁶ It is a diagnosis of exclusion, meaning the vet reaches it once other possibilities have been ruled out.⁴

Old dog back legs collapsing: treatment by cause

Treatment depends entirely on which of the causes is driving it, which is the whole point of getting a diagnosis.

Disc disease. Medical management consists of very strict movement restrictions for four weeks combined with medication, and is often recommended for dogs with a first episode of back pain or mild signs.² Surgery is usually recommended for patients unable to walk, or for dogs with recurrent or persistent back pain.² The outlook is genuinely encouraging in the right cases: the prognosis with surgery is good for dogs that can still feel their feet, and many have an excellent chance of returning to walking.² Strict rest is required in the first three to six weeks after a disc bulge or rupture, with or without surgery.⁸

Arthritis and hip pain. Arthritis and hip dysplasia can add to a dog's loss of hind end function, and your vet treating these concurrent problems may provide some relief, even in dogs who also have a nerve disease.¹

Degenerative myelopathy. There is no cure, but routine physical therapy may delay the clinical progression of the disease.⁶ The goal is to keep the dog on its feet for as long as possible.¹ Progression is real and worth planning for: it typically worsens over six months to a year, resulting in paralysis of the hind legs.⁵

We go deeper into the options in our guide to treatment choices for weak back legs. Medication decisions belong with your vet, always.

What to do at home this week

Start with traction, then remove the jumping, then add support.

• Floors. Use rugs, carpets or yoga mats on hardwood and tiled surfaces.⁶ Lay a continuous path from the bed to the door so there is never a slick patch to cross.
• Nails and paws. Keep nails short. Check the tops of the back feet daily for scuffs.
• Boots. Booties reduce damage to scuffed paws,⁶ and dog boots protect the knuckles and toenails from dragging and being scraped.⁴ Non-slip socks help indoors; boots are for outside.
• Stairs and jumping. Add pet ramps or steps where necessary.⁶ Block the sofa and the car boot until you have a ramp.
• A sling or harness. A sling or harness can assist with walking and standing.⁶ A folded towel under the belly works in a pinch for late-night bathroom trips. Dogs with neck involvement should be fitted with a harness instead of a neck collar.⁸
• Weight. Avoiding obesity matters, so diet and exercise are vital parts of management.¹ Getting to and holding a healthy weight helps a dog recover faster and stay active.⁸
• Bedding. Soft bedding helps prevent bedsores, which can develop if a dog can't walk.⁴ Turn a dog who cannot reposition himself.

Keep a simple diary: date, what you saw, how long the walk was. Patterns show up in writing that you will not notice day to day.

Rebuilding and protecting hind-end strength

With degenerative myelopathy, exercise and physical therapy are among the few things shown to help, and doing little or nothing is worse: dogs given intensive physical therapy were able to walk significantly longer than dogs receiving moderate or no physical therapy.⁴ Any dog with DM should be kept as physically active as possible for as long as possible,¹ because physical therapy slows clinical progression and helps maintain muscle mass.⁶

What that looks like in practice:

• Short, frequent, flat leash walks rather than one long one. Stop before the wobble starts, not after.
• Swimming and water work. Walking and swimming are both named as core parts of management.¹
• Hands-on therapy. Physiotherapy may include acupuncture, therapeutic laser, massage, hydrotherapy and passive range of motion, where you gently move the joints through their normal movement for the dog, to prevent loss of muscle mass.⁸
• Sit-to-stand and weight-shifting work, taught by a rehab vet so you are loading the right muscles and not the sore joint.
• Acupuncture as an add-on. For dogs that cannot walk but still have feeling in the feet after a disc rupture in the mid or lower back, acupuncture alongside medical management is more likely to result in recovery of walking, and a quicker recovery, than medical management alone.⁹
• Laser therapy, also called photobiomodulation, has shown promising results, but more research is still needed.¹

The one exception: if your vet has prescribed crate rest after a disc episode, follow it exactly. The whole point of the activity restriction is to allow the disc time to heal.²

When a rear support wheelchair makes sense

A rear support cart makes sense when the front end is still strong and the back end can no longer carry the dog reliably on walks.

If a dog's front limbs are strong enough, a vet may recommend a mobility device such as a cart to help the dog get around.³ A wheelchair to support the hind limbs sits alongside slings, boots, ramps and rugs on the standard list of management tactics.⁶

Common moments owners decide it is time: the back legs cross or buckle on ordinary walks, the paws are getting scraped, the dog gets out of the door but cannot make it round the block, or you are doing every walk with a towel under the belly and your back is finished.

Dogs vary in how they take to it. The nature and temperament of the individual dog determines whether a mobility aid such as a cart for dogs whose back legs no longer work improves quality of life in the short term.¹

The OldPal Rear Support Dog Wheelchair is built for exactly this stage. The padded harness carries weight through the hips and chest rather than the spine, every strap adjusts, and the frame is set so the back legs hang free or lightly brush the ground. Dogs can squat and go to the bathroom while in the chair. The aluminum frame is light, the wheels handle grass and gravel, and there are five sizes covering rear leg heights from 3 to 27 inches.

Sizing uses one measurement: rear leg height, from the top of the hip straight down to the toe pad, measured with your dog lying on his side and the leg at its natural bend. Take that measurement, then use the size guide and fit finder or send a photo and the number to help@oldpalpets.com and a person will check it for you. If the size is wrong, our Fit Guarantee lets you exchange the frame for the size that fits. You can see the whole thing on the rear support wheelchair page. Mini, Small and Medium chairs arrive within 1 to 2 weeks, Large and XL within 2 to 3 weeks, continental US only.

Introducing the chair without a fight

Keep the first sessions short, supervised and on easy ground.

Fit it indoors first with the harness snug but not tight, and check that the frame height leaves the back feet either hanging clear or just brushing the floor. Then go outside for five or ten minutes on grass or a flat path, with treats, heading somewhere your dog already likes. Build up over a week.

Supervise every session. A cart is for walks and active time, not for napping, lying down or being left alone in the house. Most dogs use it in blocks of twenty to forty minutes at a time, a few times a day, and rest out of it in between. Avoid deep sand, steep slopes, stairs and ice. Check the skin under the straps after every outing, especially in the first fortnight.

Living with a dog who is partly down

Good daily care is mostly hygiene, skin checks and keeping the dog's mind busy.

Bladder and bowel function are generally normal in the early stages of degenerative myelopathy, but as the disease progresses to paralysis, a dog may lose control of urine and stool.¹ Dogs who become incontinent need help from their families to empty the bladder by hand.³ Dogs in this situation need frequent bathing and can develop skin infections from lying in their own waste.³ Washable bedding, a clipped sanitary area and a barrier cream recommended by your vet make this manageable.

Check the tops of the back feet and the hocks every evening. Rotate a lying dog every few hours. Use the sling for night trips outside rather than letting him drag. Feed some meals from a snuffle mat, keep up scent games and training with the front half of the body, and get the dog outside daily even if the walk is now two minutes long.

What life actually looks like

Dogs managed medically for disc disease with minimal nerve deficits and well-controlled pain have a fair to good prognosis.² For most dogs with neck disc disease, the long-term outlook is favorable.⁸ Where the cause is progressive, the realistic aim is a good stretch of mobile, comfortable time with the right support in place, and your veterinarian will assess your dog's circumstances and help you decide which options fit.¹

Frequently asked questions

Related guides

• Back leg problems in dogs: the full overview
• Treatment options for weak back legs
• Back legs giving out in boxers
• How to measure your dog for a wheelchair

Sources

Related guides

• Dog Can't Walk: Causes, Care and Next Steps
• Cushing's Disease and Weak Back Legs in Dogs: Why It Happens and What Helps
• Dog Back Legs Shaking: Causes and When to Worry
• Hip Dysplasia in Dogs: Signs, Diagnosis and Treatment
• Wobbler Syndrome in Dogs: Why the Neck Weakens the Back Legs