TL;DR
- Go to the vet today if the leg carries no weight, both legs are affected, or your dog is dragging or wobbling.
- Rest on leash only while you wait, no human pain relievers, and call if limping lasts over 24 hours.
A torn cranial cruciate ligament, the knee ligament that keeps the joint stable, is the most common orthopedic condition in dogs1 and a leading cause of hind limb lameness and pain.2 If the leg takes no weight, if both back legs are involved, or if the limp came with dragging or wobbling, see a vet today. Start with our overview of back leg problems in dogs.
The most common reasons for a back leg limp
- Cranial cruciate ligament (CCL) tear. Tears usually come from the ligament breaking down over time and can happen during ordinary daily activity.3 Early signs include a "lazy sit" with the back legs off to one side, hesitating before stairs, muscle loss in the affected leg, and slight or on-and-off limping; a complete rupture can leave a dog suddenly very lame and unable to bear weight on that leg.4 Some dogs "toe touch," placing only a little weight on the injured leg.4 Between 40 and 60% of dogs affected in one knee will develop it in the other knee too.2
- Arthritis, meaning wear and damage in the joint. All dogs with a cruciate rupture will develop arthritis in the affected knee.4 More in our guide to arthritis in a dog's back legs.
- Hip dysplasia. Hips and knees often travel together: in a review of dogs treated surgically for cruciate disease, 36.3% had hip dysplasia on X-ray.5
- Luxating patella, a kneecap that slips out of its groove. Knee problems like this are among the factors that may contribute to the cruciate ligament weakening.4 Owners often describe a skip, then a normal stride again.
Is it pain, or is the leg not working?
A painful limp still tries to use the leg: the dog shortens the stride, hops or toe touches, but the foot lands the right way up. Look for knuckling (walking on the top of the paw instead of the pads), scuffed nails on the back feet, and a wobbly "drunken sailor" walk with the hind feet crossing. Dogs with disc disease may limp, drag their legs, or hunch their back.6
Spinal causes that can look like limping
Intervertebral disc disease (IVDD), trouble with the cushioning discs of the spine, is a common source of back pain in older dogs and in younger dogs of prone breeds.7 Nerve damage tends to follow a predictable pattern: back pain first, then a wobbly hind end, then complete loss of use of the back legs, usually alongside loss of the ability to urinate normally.8 For legs that quit in a matter of hours, read what to do when a dog suddenly can't walk.
When your dog can't put weight on back legs, go now
A back leg carrying no weight at all is urgent, not wait-and-see. Go to a vet immediately if you see:
- No weight on the leg whatsoever, or both back legs affected
- Sudden inability to stand, or dragging of the back end
- Loss of bladder or bowel control
- Crying out, or an obviously swollen or deformed leg
These signs need immediate veterinary attention, and the absolute emergency is a dog unable to walk.6 A ruptured disc is generally considered a true surgical emergency, and the outlook depends on how much function remains when the dog is treated.8 The longer you wait, the greater the chance the spinal cord will not recover.7
How your vet will work it out
It starts with hands, not machines. Cruciate tears can be diagnosed from a hands-on exam alone.2 Your vet will check the knee for abnormal movement in the joint, and sedation may be needed if your dog is painful, tense or heavily muscled.4 A thorough physical exam is often all that is needed for a mild case, though X-rays may be done too.7 If your dog has more than mild pain, your vet may refer you to a veterinary neurologist, a nerve and spine specialist.7
What to do at home before the appointment
Rest, traction and patience. For a disc that is mildly inflamed or has partly slipped out of place, what the dog really needs is rest.6 Strict activity restriction, such as leash walks only, is typically most effective at reducing pain.2
- Leash-only potty breaks, then straight back in. Minimise stairs and jumping on and off a deck, bed or sofa.7
- Support the back end with a folded towel under the belly, in front of the back legs. Our guide to using a sling for weak back legs shows the hold.
- Do not give human pain relievers or leftover medication; anti-inflammatory drugs should be used only as directed by your vet.6
Footing and home setup
Good footing keeps a wobbly dog from getting worse: rugs and runners along your dog's usual routes, short nails, trimmed hair between the pads, toe grips for slick tile, raised bowls. Walking is safe for any dog; leaping for a thrown toy, not so much.7 If stairs are unavoidable, see how to handle stairs with bad back legs, and swap high-impact games for gentler enrichment.
Rear support: slings, harnesses and wheelchairs
Match the support to how long you need it. A towel or sling is for short-term recovery and lifting. Switching to a body harness instead of a neck lead is one of the common lifestyle changes suggested after disc surgery.8 If the front legs are strong enough, a vet may recommend a cart to help a dog with paralysed hind legs get around, though it does not treat the spinal cord compression behind the paralysis.6
The OldPal Rear Support Dog Wheelchair is built for dogs with weak or failing back legs. The padded harness carries weight through the hips and chest rather than the spine, and dogs can squat to go to the bathroom while in it. Five sizes cover rear leg heights from 3 to 27 inches: check the measuring guide and fit finder, or email help@oldpalpets.com with a photo and a measurement.
Recovery and the long view
Physical rehabilitation can speed a dog's recovery and improve final outcomes.2 The long-term outlook after surgical repair of cruciate disease is good, with significant improvement reported in 85 to 90% of cases.2 Recovery after disc disease usually spans weeks to months.8 Keeping your dog at a healthy weight is important for preventing pain and lameness.3 For the day-to-day, see caring for a dog with weak back legs and our guide to weakness in senior dogs.
Frequently asked questions
How long should I let my dog limp before going to the vet?
Check with your veterinarian, especially if the limping lasts longer than 24 hours.3 Don't wait that long if the leg is carrying no weight, if both back legs are affected, or if your dog cried out. A single skip after hard play that clears within a few hours is less worrying, but write down the date so you can spot a pattern.
Will my dog's limp heal on its own with rest?
Some dogs with a mildly inflamed or partly slipped disc do settle, and rest really makes a difference for them.6 Partial tearing of the cruciate ligament is common in dogs and almost always progresses to a full tear over time.2 Scar tissue may stabilise the knee, but it stays prone to reinjury when the dog is active again.2 Rest while you wait for the exam, not instead of it.
Should I be worried if my dog is limping but isn't crying or whining?
Yes. Pain is expressed differently in dogs than in people, so although a dog may not whine, cry out, or constantly hold up the affected limb, the persistence of the lameness is itself a sign of pain.2 Stoic dogs simply slow down, sit crooked, stop jumping on the sofa, or lag on the second half of a walk.
Related guides
- When a dog suddenly can't walk
- When back legs give out
- Caring for a dog with weak back legs
Good days ahead.
Sources
Sources (8)
- Gilley RS, Vukicevich M, Blowers A, McCarthy M, Brock D, Conway E (2026). Canine Pelvic Limb Model is Valid for Teaching Veterinary Students to Assess Cranial Cruciate Ligament Stability. Journal of veterinary medical education. doi:10.3138/jvme-2025-0154
- American College of Veterinary Surgeons. Cranial Cruciate Ligament Disease. acvs.org
- University of Illinois Veterinary Medicine. CCL Injuries in Dogs: What They Are, How to Fix Them. vetmed.illinois.edu
- VCA Animal Hospitals. Cranial Cruciate Ligament Disease in Dogs. vcahospitals.com
- Courzereaux B, Martenne-Duplan A, Szwec D, Gatineau M, Plante J, Clerfond P, Da Silva M, Terreros A. (2026). Prevalence of canine hip dysplasia and its association with cranial cruciate ligament deficiency in dogs undergoing tibial plateau levelling osteotomy: a retrospective study. New Zealand veterinary journal. doi:10.1080/00480169.2026.2728624
- American Kennel Club. Intervertebral Disk Disease in Dogs: Causes, Symptoms, and Treatment. akc.org
- Cornell University College of Veterinary Medicine. Intervertebral disc disease. vet.cornell.edu
- American College of Veterinary Surgeons. Intervertebral Disc Disease. acvs.org
