CONDITION
Spondylosis in Dogs
Spondylosis is the formation of small bony bridges that grow between adjacent vertebrae in the spine, typically along the underside of the spinal column. These bridges develop as a response to wear and movement over time, most often in older dogs, and represent the skeleton's way of reinforcing segments that have become less stable as the soft tissues between the bones age. Many dogs with spondylosis show no signs at all, and the changes are discovered incidentally on X-rays taken for other reasons. When signs do appear, they tend to be subtle: a slightly altered gait, occasional stiffness after rest, reluctance to jump or climb stairs, or sensitivity when the back is touched. The pattern and severity vary widely, depending on where the bridges form and whether a spur presses on a nerve root where it leaves the spine. This page explores what can be observed in a dog with spondylosis, what is happening beneath the surface in the spine, how the condition is identified through imaging, and the range of approaches used when discomfort or limitation is present.
Why this matters now
Spondylosis tends to develop in middle-aged and older dogs. It is uncommon in dogs under two years old, and by nine years of age 25% to 70% of dogs are affected. Boxers, German Shepherd Dogs and Flat-Coated Retrievers appear predisposed, and a genetic predisposition has been identified in Boxers, though the condition can develop in dogs of any size and becomes increasingly common with age. The condition represents cumulative wear rather than a sudden event, and many dogs carry these bony changes without ever showing signs.
The bony growths develop slowly, often over months to years, as the spine responds to age-related changes in the intervertebral joints. New bone formation may occur at one level or several, and bridges between adjacent vertebrae can remain incomplete or progress to solid fusion. The rate and extent of progression vary widely between individuals; some dogs develop only small spurs that never enlarge, while others form extensive bridging across multiple segments.
Signals & patterns
Early signals
Stiffness after rest
A dog may take a few extra steps to loosen up after lying down, particularly first thing in the morning or after a long nap. The stiffness often eases once the dog has been moving for a short while.
Reluctance to jump up
Activities that require spinal extension or flexion, such as jumping onto furniture or into a car, may become less appealing. The dog may hesitate, approach and turn away, or seek an alternative route.
Slower on stairs
Negotiating stairs places particular demand on spinal flexibility. A dog may take stairs more carefully, one at a time, or begin to avoid them when other routes are available.
Change in gait or posture
Subtle alterations in the way a dog carries itself, such as a shorter stride, less willingness to extend the back legs fully, or a slightly guarded topline, can reflect reduced spinal mobility.
Later signals
Reduced willingness to play
Dogs with more advanced changes may opt out of games that involve twisting, turning sharply, or running at speed. The enthusiasm may remain, but the follow-through becomes more measured.
Difficulty rising from lying
Getting up from a resting position may require more effort, particularly if the dog has been still for an extended period. Some dogs shift position several times before committing to standing.
Sensitivity along the back
Discomfort when the spine is touched, stroked firmly, or manipulated can develop, though this is not universal. The reaction may be withdrawal, tension, or a low vocalisation.
Click to read about the biological mechanisms
How this is usually investigated
Spondylosis is most often discovered incidentally on radiographs taken for another reason, such as pre-anaesthetic screening or investigation of lameness. When signs of stiffness or discomfort raise suspicion, the investigation typically begins with a thorough history focusing on changes in gait, posture, and willingness to move, followed by careful physical examination to localise areas of reduced spinal flexibility or discomfort on palpation. Imaging then shows the bony changes, though the presence of spondylosis on a radiograph does not correlate with clinical signs.
Physical examination
Radiography
Computed tomography (CT)
Magnetic resonance imaging (MRI)
Options & trade-offs
Management of spondylosis is highly individualised, reflecting the wide variation in clinical impact between dogs. Many animals require no specific intervention at all, whilst others benefit from a combination of approaches aimed at easing discomfort and maintaining mobility as the spine stiffens. What works well for one dog may be impractical or unnecessary for another, and the goal is usually to support quality of life rather than to reverse changes that are already established.
Activity modification and environmental adjustment
This involves tailoring exercise to the individual dog's tolerance, often favouring shorter, more frequent walks over long or high-impact activities, and avoiding repetitive jumping or twisting movements that may aggravate discomfort. Environmental changes such as non-slip flooring, ramps in place of stairs, and supportive bedding can reduce mechanical strain on the spine and make movement easier. The aim is to maintain muscle tone and joint mobility without provoking flare-ups of discomfort.
Trade-offs: Activity modification requires observation and adjustment over time, and what is appropriate may change as the condition progresses or as the dog ages. Some dogs tolerate restriction poorly, and finding the balance between adequate exercise and overloading can be subtle, particularly in working or highly active breeds.
Anti-inflammatory and analgesic medication
Non-steroidal anti-inflammatory drugs (NSAIDs) are commonly used during periods when discomfort is more evident, aiming to reduce pain and improve mobility. Other analgesics may be added when pain appears to have a neuropathic component or when NSAIDs alone are insufficient. These include tramadol, which is authorised for dogs in the UK for mild musculoskeletal pain, and gabapentin, a human medicine used in dogs under the veterinary medicines cascade because no gabapentin product is authorised for dogs in the UK. Medication is often used intermittently rather than continuously, guided by clinical signs.
Trade-offs: Long-term NSAID use requires monitoring for gastrointestinal, renal, and hepatic side effects, particularly in older dogs who may have concurrent conditions. Not all dogs respond equally, and some experience little benefit from medication, whilst others may develop adverse effects that limit ongoing use.
Weight management
Maintaining a lean body condition reduces the mechanical load on the spine and joints and can make movement easier and more comfortable. It is particularly relevant in dogs that also have osteoarthritis.
Trade-offs: Achieving and maintaining an ideal weight requires consistent attention to diet and exercise, which can be challenging in dogs with reduced mobility or in multi-pet households. The benefit builds gradually, and weight management alone may not be sufficient in dogs with significant clinical signs.
Physiotherapy and controlled exercise
Structured physiotherapy programmes may include hydrotherapy, passive range-of-motion exercises, and targeted strengthening work to maintain muscle mass and spinal flexibility. Hydrotherapy in particular allows exercise with reduced weight-bearing, which can be helpful for dogs who struggle with land-based activity. The goal is to preserve function and comfort for as long as possible.
Trade-offs: Access to veterinary physiotherapy is not universally available, and ongoing sessions represent both a time and financial commitment. The degree of benefit varies between individuals, and some dogs find water work stressful or are unable to participate due to other health conditions.
Nutraceuticals and joint supplements
Supplements containing glucosamine, chondroitin, omega-3 fatty acids, or other compounds are sometimes used with the aim of supporting joint health and reducing discomfort, though the evidence base for their efficacy in spondylosis specifically is limited. They are generally well tolerated and may be considered as part of a broader management strategy, particularly in dogs with concurrent osteoarthritis.
Trade-offs: The clinical benefit of nutraceuticals is variable and often modest, and they are not a substitute for other management approaches when significant discomfort is present. Quality and formulation vary widely between products, and the cost can accumulate over the long term without guaranteed improvement in clinical signs.
Common misconceptions
"Spondylosis is always painful and will inevitably lead to paralysis or severe disability."
Most dogs with spondylosis experience no pain or functional limitation at all, and the condition is often discovered incidentally on radiographs taken for unrelated reasons. Paralysis is exceedingly rare, as the bony changes typically occur on the ventral and lateral surfaces of the spine, well away from the spinal cord itself. Weakness or wobbling in the back legs, scuffing or dragging of the back feet, or loss of bladder control are not typical of spondylosis and point to another spinal problem such as a herniated disc. With a herniated disc, the chances of recovery fall if surgery is delayed more than 24 hours after pain sensation in the legs is lost, and that loss cannot be judged at home. The clinical course is highly variable, and many dogs live comfortably with extensive spinal bridging.
"Spondylosis can be reversed or cured with the right treatment."
Once bony bridges have formed, they are permanent structural changes and cannot be dissolved or reversed by medication, supplements, or other interventions. Management is aimed at maintaining comfort and mobility, easing discomfort when a spur presses on a nerve root or limits spinal movement, and supporting quality of life as the spine ages. The goal is adaptation rather than cure.
"All stiffness or back pain in older dogs is due to spondylosis."
Whilst spondylosis is common in ageing dogs, many other conditions can cause similar signs, including intervertebral disc disease, osteoarthritis of the limbs or hips, muscle strain, spinal tumours, and degenerative lumbosacral stenosis. Radiographic changes typical of spondylosis may coexist with other sources of pain, so a thorough investigation is often needed to clarify what is contributing to an individual dog's discomfort.
Related conditions
Osteoarthritis in Dogs
Osteoarthritis and spondylosis often occur together in ageing dogs, as both involve degenerative changes in skeletal structures that affect mobility and comfort. The bony bridging seen in spondylosis can develop alongside cartilage breakdown in nearby joints, forming part of a broader pattern of age-related musculoskeletal change.
Intervertebral Disc Disease in Dogs
Spondylosis and intervertebral disc disease both involve pathology of the spine, though they differ in mechanism and location. In some dogs, the bony spurs of spondylosis may develop near sites of previous disc degeneration, and distinguishing which process is contributing to clinical signs can require imaging and clinical correlation.
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Degenerative Myelopathy in Dogs
Degenerative myelopathy and spondylosis can both affect gait in older dogs, but they arise from different mechanisms: degeneration of the spinal cord in one, and bony change along the vertebrae in the other. Degenerative myelopathy causes gradually worsening, painless weakness and wobbling of the back legs, whereas spondylosis, when it causes signs at all, typically causes stiffness. Both can be present in the same older dog, but spondylosis does not explain progressive weakness, and degenerative myelopathy is diagnosed by using MRI or myelography and spinal fluid analysis to rule out compressive and inflammatory spinal diseases.
Obesity in Dogs
Obesity increases mechanical loading on the spine and joints, while the pain or stiffness associated with spinal pathology can reduce activity levels and contribute to weight gain. This creates a cycle in which musculoskeletal and metabolic factors influence one another over time.
If stiffness or changes in movement have been noticed, it can be useful to observe how these signs fluctuate over time and whether particular activities seem to provoke or relieve them, as this pattern often informs the shape of management. Dogs with spondylosis may also develop other age-related conditions affecting mobility, so a broader view of musculoskeletal health (including hips, elbows and muscle condition) can provide helpful context. Understanding how pain and mobility interact in older dogs, and what options exist to support comfort without necessarily pursuing a single diagnosis, is often a worthwhile area to explore.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS