Discospondylitis in dogs: radiographs and diagnosis
5-year-old intact male Great Dane with lumbosacral pain, intermittent fever and weight loss. The lateral radiograph shows lysis of the L7 and S1 endplates on both sides of the disc, with an irregular disc space, sclerosis and ventral new bone formation.
What is the most useful next step?
chevron_right Show answer and explanation
A. Anti-inflammatory corticosteroids and rest
The images indicate infection of the disc and endplates. Corticosteroids would worsen it and mask its progression.
B. Interpret it as spondylosis deformans and prescribe NSAIDs
In spondylosis, ventral osteophytes bridge the vertebrae but the endplates remain intact and smooth. Endplate lysis defines discospondylitis.
C. Blood cultures, urine culture and Brucella canis serology
Correct. Endplate lysis on both sides of the disc is typical of discospondylitis. Identifying the agent (often Staphylococcus pseudintermedius) guides prolonged antibiotic treatment; Brucella canis is zoonotic and must be ruled out.
D. Urgent myelography
There are no neurological deficits requiring assessment of cord compression, and myelography is invasive. If more information is needed, MRI is preferable.
lightbulb Key takeaway
Radiographic signs take 2–4 weeks to appear: with compatible clinical signs and normal radiographs, repeat them or use MRI or CT. Radiograph the entire spine, as multiple sites may be affected. During treatment, clinical improvement guides decisions; radiographic remodelling lags behind.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.