Sudden back pain, a hunched posture, or wobbly, dragging hind legs in a dog often points to intervertebral disc disease, where disc material presses on the spinal cord. Treat it as urgent. Confine your dog, do not let them walk it off, and seek veterinary assessment the same day. Inability to urinate is an emergency on its own.
What intervertebral disc disease actually is
Your dog’s spine is a chain of small bones with a cushion between each pair. Those cushions are the intervertebral discs, and each one has a firm outer ring wrapped around a softer centre. Their job is to absorb shock and let the spine bend without the bones grinding on each other.
Running through the middle of that chain is a bony tunnel carrying the spinal cord. There is almost no spare room inside it. When a disc degenerates and its contents push upward into that tunnel, whether they burst through in a moment or bulge slowly over months, the cord has nowhere to move. That pressure is what causes the signs owners see.
Pressure hurts first. If it continues or worsens, it starts to interrupt the signals travelling between the brain and the back half of the body: the messages that tell the hind legs where they are, the ones that tell them to move, and the ones that control the bladder. A disc problem in the neck produces a different picture again, usually severe neck pain and sometimes front-leg lameness.
Which dogs are affected most often
Some breeds are built with discs that mineralize and become brittle early in life, sometimes before their second birthday. Those are the chondrodystrophic breeds, the ones with long backs and short, bowed legs, and they are heavily over-represented:
- Dachshunds, by a wide margin
- French bulldogs
- Corgis
- Beagles
- Shih tzus and Pekingese
- Basset hounds and cocker spaniels
Any dog can be affected, though. German shepherds, Labradors, mixed breeds and larger dogs get disc disease too, more often as a gradual protrusion in middle or older age rather than a sudden rupture. Do not rule the problem out because your dog is the wrong shape.
The trigger is usually unremarkable. Jumping off the couch, misjudging a back step, twisting while turning at speed. Late summer moving into early fall is a period when we see the ordinary triggers stack up in Surrey: the July heat eases, so dogs are back on longer trail walks and in and out of the car for weekend trips, and the first real autumn rain turns decks, back stairs and tailgate ramps slippery. None of that causes disc disease. It is simply when a disc that was already fragile finally gives way.
The spectrum, from painful to unable to move
Disc disease is not one presentation. It sits on a range, and where your dog lands changes how quickly they need to be seen.
Painful but still walking. This is the stage that gets dismissed, and it is the stage where you have the most options:
- A hunched or roached back, with a belly that feels tight and tense
- Yelping when picked up, or flinching away from being lifted at all
- Trembling, panting at rest, pacing and unable to settle anywhere
- Refusing stairs, furniture or the car when they normally manage them easily
- With neck cases, holding the head low and rigid, unwilling to look up or turn toward you
Wobbly or uncoordinated. The back end is now involved:
- Legs crossing over each other or splaying out
- Knuckling over onto the tops of the paws, with scuffed nails from dragging
- A swaying, drunken walk that gets worse the further they go
- Sitting or lying down partway through a short walk
Non-ambulatory. The back legs cannot carry weight, the dog drags themselves forward on the front legs, the tail hangs limp, and urine or stool may leak. A dog who was walking this morning and cannot stand this evening is a time-sensitive case.
The sign owners miss most: a bladder that cannot empty
This is the single most important point in this article. The nerves that move the hind legs also control the bladder, so a dog can lose the ability to urinate while still looking to you like they are simply weak or sore.
Leaking urine is not reassurance. When a bladder fills past its limit, it overflows, and that dribble looks like normal urination to an owner watching from across the room. Underneath, the bladder is still stretched, still filling and still unable to empty properly. That is painful in its own right, it can damage the bladder wall, it invites infection, and pressure can eventually back up toward the kidneys.
Signs that warrant an immediate visit, whether or not your dog is walking:
- No proper urination in eight to twelve hours
- Repeated squatting or straining with little or nothing produced
- A firm, tense, painful swelling low in the abdomen
- Constant dribbling, or a wet bed with no obvious posturing
Do not press on your dog’s abdomen to try to empty the bladder. It is genuinely dangerous in an over-filled bladder and it is not an owner task. Let the veterinary team assess and manage it.
Deep pain sensation, and why the clock is real here
When a veterinarian examines a suspected disc case, they work through a neurological exam that grades how far the problem has progressed: painful only, weak but walking, unable to walk but still moving the legs voluntarily, no voluntary movement, and finally loss of deep pain sensation.
Deep pain is the deepest and most resilient pathway in the spinal cord, and it is the last one to fail. Testing it means applying firm pressure to a toe and watching for a conscious response, turning the head, crying out, trying to bite, rather than the leg simply pulling away, which is only a local reflex and can persist even when the cord is severely compromised. That distinction is why the test belongs to a veterinarian. Please do not try it at home: a dog in this much pain will bite, and rough handling can worsen the injury.
The reason this matters at eleven at night rather than Monday morning is straightforward. As a general principle in spinal cord injury, the longer significant compression continues, the less favourable the outlook becomes, and that is most pronounced once deep pain sensation has been lost. Nobody can promise an outcome in either direction. What can be said honestly is that waiting is not a neutral choice, and that the options available on the night are usually broader than the options available two days later.
What to do at home before you get in the car
- Confine immediately. Crate, playpen or a small room with non-slip footing. No stairs, no furniture, no garden zoomies, not even a short walk on the lawn.
- Do not let your dog walk it off. Movement grinds displaced disc material against an already inflamed cord. Rest is not optional comfort care here, it is part of the treatment.
- Carry with the spine supported. Keep the body level, like a plank. For a small dog, one forearm under the chest and one under the hips so nothing sags in the middle. For a larger dog, use a rigid board, a firm pet bed or a folded blanket as a stretcher with a second person, and lift together.
- Never give human painkillers. Ibuprofen, naproxen, acetaminophen and aspirin are all dangerous to dogs and can cause serious harm on top of the original problem. They also make it harder for us to treat the pain safely once you arrive.
- Leave the back alone. No massage, no stretching, no heat packs, no pressing along the spine to find the sore spot. It can make things worse and it tells you nothing useful.
- Phone before you feed. Sedation or anesthesia may be part of the plan, so check with us first rather than offering a meal on the way in.
- Write down the timeline. When it started, how fast it changed, the last time your dog urinated normally, and any jump or fall you witnessed. A short phone video of the walk taken safely from a distance is genuinely useful to us.
How a suspected disc injury is assessed after hours
Assessment starts with your history and a full physical and neurological exam. Gait, posture, placing reactions, reflexes and careful palpation along the spine help localize which region is involved and how severely the cord is affected. The bladder is checked early and managed by the team if it is not emptying.
Comfort comes first. A dog in acute spinal pain cannot be examined properly or rest properly until that is addressed, so emergency pain management is usually the first intervention rather than the last. Our earlier article on pain management and control in pets explains how that assessment works in more detail.
From there, on-site emergency pet diagnostics including digital radiographs and bloodwork help rule out fractures, some masses and other causes of a painful, weak back end. It is worth understanding the limitation honestly: plain X-rays show bone well, and can show a narrowed disc space, but they cannot show the spinal cord itself or confirm exactly where and how badly it is compressed.
Confirming that requires advanced imaging, a CT or MRI performed at a referral facility, and it is the step that a surgeon or veterinary neurologist needs before operating. If your dog’s case is heading that way, our team arranges veterinary specialist referrals and sends the clinical records and findings across so nothing has to be repeated. Stabilizing your dog and getting that conversation started is exactly what after-hours emergency veterinary services exist for.
Conservative management or surgery: a conversation, not a formula
There are two broad paths, and choosing between them is a discussion with your veterinary team rather than something you can decide from an article. What shapes it: how severe the deficits are, how fast they appeared, how long they have been present, what imaging shows, your dog’s age and other health conditions, and what is realistic for your household.
Conservative management means strict confinement measured in weeks rather than days, prescribed anti-inflammatory and pain medication under veterinary direction, bladder care where needed, and a gradual, controlled return to activity. Owners consistently underestimate the confinement part. It is the treatment, and cutting it short is the most common reason a recovering dog goes backwards.
Surgical management means decompression, removing the disc material pressing on the cord, carried out by a surgeon or neurologist at a referral hospital, usually after CT or MRI. It is generally considered most urgently when a dog cannot walk, when signs are worsening quickly, or when pain cannot be controlled medically.
Neither route comes with a promise. What we can do at two in the morning is control your dog’s pain, assess the grade properly, protect the bladder, and lay out the real options with the time pressure explained clearly, so the decision you make is an informed one.
In cats, sudden hind-leg weakness is usually a different emergency
If it is your cat who has suddenly lost the use of the back legs, disc disease is not the first concern. In cats, that picture much more often reflects a blood clot that has lodged where the main artery divides toward the hind limbs, cutting off circulation to the back end. It is sometimes called a saddle thrombus.
The presentation is distinctive and distressing. Cats cry loudly and continuously because it is severely painful, drag both back legs, and the hind paws feel noticeably cold compared with the front ones. Pads and nail beds may look pale, grey or bluish. Many of these cats are also breathing fast or with an open mouth, and for a great many families this is the first outward sign of heart disease that had been completely silent until that moment.
Please do not give this one an hour to improve, and do not rub or vigorously warm the legs. Come straight in. Our post on recognizing a true pet emergency covers the other red flags that belong in the same category.
Frequently asked questions
Is IVDD in dogs an emergency?
Treat it as one. A dog who is suddenly painful in the back or neck should be seen the same day, and a dog who is wobbly, dragging the hind legs, unable to stand, or unable to urinate needs to be seen straight away rather than overnight. The options available to a dog assessed early are often broader than those available after a delay, which is why guessing is a poor strategy here.
Can a dog recover from a disc problem without surgery?
Many dogs with milder disc disease do well with conservative management, though nothing is guaranteed and the sensible path varies from dog to dog. That route requires genuinely strict confinement for weeks, prescribed medication under veterinary supervision, and close monitoring for any worsening. Dogs who are already unable to walk, or whose signs are progressing quickly, are the ones for whom surgical assessment tends to be raised more urgently.
My dachshund yelps when I lift him but walks normally. Can it wait?
No, that combination deserves a prompt exam. Yelping on being lifted, a hunched back and a tense abdomen are classic early signs of spinal pain, and this is precisely the stage where confinement and proper pain control matter most. A dog who is painful today can become unable to walk within hours, so being assessed while they are still walking is an advantage, not an overreaction.
Why can my dog not urinate after hurting his back?
The nerves controlling the bladder run through the same part of the spinal cord that supplies the hind legs, so compression can affect both together. A dog may lose the ability to empty the bladder voluntarily even while still shuffling around. Dribbling urine can simply be overflow from a bladder that is dangerously full, so it should never be taken as proof that things are working normally.
What should I avoid doing if I think my dog has injured their back?
Avoid letting them walk, jump or use stairs, avoid massaging or manipulating the spine, avoid heat packs, and never give any human pain medication. Do not press on the abdomen to try to empty the bladder. Confine your dog somewhere small and non-slip, support the spine when you lift them, and phone us before you set off so we can be ready when you arrive.
Back trouble tonight? Call us on your way in
A dog who cannot use their back legs at nine on a Saturday evening cannot wait for a daytime clinic to open, and that gap is the reason Mainland Animal Emergency Clinic exists. Phone (604) 588-4000 from the road, and our Surrey team will have a plan ready before you pull in. You can see the full range of emergency veterinary services we provide for dogs and cats on statutory holidays, right through every weekend, and every night of the week.
Published by the team at Mainland Animal Emergency Clinic.
This article is provided for general educational purposes only and is not a substitute for an in-person veterinary exam, diagnosis or treatment. If your pet has an urgent problem during our emergency hours, please call Mainland Animal Emergency Clinic directly. During regular daytime hours, contact your primary veterinarian or another open veterinary hospital.
Mainland Animal Emergency Clinic
15338 Fraser Highway, Surrey, BC V3R 3P5
Phone: (604) 588-4000
Emergency Hours: Monday to Friday 5:00 PM to 8:00 AM
Saturday and Sunday: 24 hours
Statutory Holidays: 24 hours
Dogs and cats only. No referral needed.