CONDITION
Discospondylitis
Discospondylitis is an infection involving one or more of the intervertebral discs—the cushioning structures that sit between the bones of the spine—and the adjacent vertebrae themselves. The infection can arrive through the bloodstream from elsewhere in the body, or more rarely through direct penetration or spread from nearby structures. It tends to cause pain localised to the affected area of the spine, and in some cases may affect nerve function if swelling or structural change begins to compress the spinal cord. Owners often notice reluctance to move, stiffness, a hunched posture, or sensitivity when the back is touched. Some dogs may show more generalised signs such as reduced appetite, low energy, or fever, particularly in the earlier stages. Cats are less commonly affected, but similar patterns can occur. The signs can develop gradually or appear more suddenly, and the severity varies depending on the location and extent of the infection. This page explores the signals that may appear, what is happening within the spine and surrounding tissues, how the condition is investigated through imaging and laboratory tests, and the range of approaches used to manage infection, pain, and structural stability over time.
Why this matters now
Discospondylitis tends to affect middle-aged to older dogs, typically between four and seven years of age, though cases can occur outside this range. Larger breeds appear over-represented in clinical series, possibly reflecting greater mechanical stress on the spine or other factors not yet fully understood. Male dogs may be affected somewhat more frequently than females. The condition often follows an infection elsewhere in the body—urinary tract, skin, mouth, or respiratory system—though in many cases no obvious source is identified.
The course can vary considerably between individuals. Some animals develop signs gradually over several weeks, with subtle stiffness or reduced activity noticed before pain becomes more apparent. In other cases the onset appears more sudden, with marked pain or reluctance to move developing over a few days. Without intervention the infection can persist, leading to progressive destruction of disc and bone, increasing pain, and in some cases neurological deterioration if the spinal cord becomes compressed. Early recognition and management can alter the trajectory, though the timeline for improvement is often measured in weeks to months rather than days.
Signals & patterns
Early signals
Reluctance to jump or climb
The dog may hesitate before jumping onto furniture or climbing stairs, or may avoid these activities altogether. This often reflects pain generated by spinal movement or the mechanical load placed on the affected area.
Stiffness after rest
Movement may appear restricted or guarded when the animal first stands after lying down, sometimes easing slightly with gentle activity. The stiffness tends to be most noticeable in the portion of the spine where the infection is seated.
Hunched or arched posture
The back may appear rounded or tense, particularly when standing or walking. This postural change often represents an attempt to reduce movement and mechanical stress in the painful segment of the spine.
Reduced appetite or low energy
Some dogs become quieter or less interested in food, particularly if there is systemic inflammation or low-grade fever accompanying the spinal infection. These signs can precede the more obvious pain-related behaviours.
Sensitivity when touched along the back
The dog may flinch, tense, or pull away when the spine is touched or pressed, especially over the affected disc. Some animals may vocalise or turn toward the person touching them.
Later signals
Weakness or incoordination in the limbs
If swelling, structural collapse, or new bone formation begins to compress the spinal cord, the signals it carries to the limbs may be disrupted. This can appear as wobbling, dragging of the feet, or difficulty rising.
Marked reluctance to move at all
Pain may become severe enough that the animal avoids standing or walking, remaining in one position for extended periods. This often reflects advanced infection, significant structural change, or both.
Fever or systemic signs of illness
In some cases, particularly if the infection is active and not yet controlled, there may be an elevated body temperature, lethargy, or other signs suggesting ongoing inflammation beyond the spine itself.
Click to read about the biological mechanisms
How this is usually investigated
Options & trade-offs
Last reviewed: Invalid Date ·