What Is Discospondylitis?
Discospondylitis (also spelled diskospondylitis) is an infection of an intervertebral disc and the vertebral endplates on either side. Bacteria — and less often fungi — reach the spine through the bloodstream from another site such as the urinary tract, skin, mouth, or a migrating foreign body (for example a grass awn). Medium to large adult dogs are affected most often; cats are rarely diagnosed.
It is not the same as IVDD (slipped or herniated disc disease), which is a mechanical disc problem without infection as the primary cause. It also differs from immune spine inflammation such as steroid-responsive meningitis-arteritis. Getting the diagnosis right matters because discospondylitis needs long courses of antimicrobials, not steroids alone.
Why it matters
Back pain and fever in a dog are often blamed on a strain or a simple slipped disc. Persistent pain plus systemic illness should raise the question of spinal infection.
Signs Owners Notice
- Reluctance to jump, climb stairs, or be picked up
- Back or neck pain, a hunched posture, or crying when touched
- Stiffness, limping, or weakness in one or more legs
- Fever, lethargy, and poor appetite
- In severe cases: wobbliness or inability to walk if the spinal cord is compressed
Diagnosis
Spinal X-rays may show irregular, moth-eaten endplates and a collapsed disc space, but early cases can look normal. CT or MRI is more sensitive and helps rule out IVDD, tumors, and other causes of pain. Bloodwork often shows inflammation; urine culture and blood culture try to identify the organism. Brucella testing is important in intact dogs because Brucella can cause discospondylitis and is a public-health concern. Fungal disease such as blastomycosis or aspergillosis is considered in endemic areas or when bacteria are not found.
Treatment and Outlook
- Antibiotics: long courses (often 8 to 12 weeks or longer) based on culture when possible; broad-spectrum antibiotics are started while awaiting results.
- Pain control and rest: anti-inflammatory and pain medicines plus restricted activity while the spine heals.
- Treat the source: urinary, dental, skin, or other infections that seeded the spine.
- Surgery: uncommon; reserved for unstable spines, large abscesses, or when samples are needed and medical care fails.
- Antifungal therapy: if a fungus is confirmed.
Many dogs improve within days to weeks of appropriate antibiotics, but imaging lag means X-rays can look worse before they look better. Relapse can occur if treatment is stopped too soon. Outlook is good for bacterial cases caught before severe neurologic damage; fungal and Brucella cases need specialist guidance and a more guarded plan.
Practical Tips for US Pet Owners
- Finish the full antibiotic course even after your dog seems normal.
- Ask about Brucella testing before breeding or if your dog is intact with spinal infection.
- Seek neurology or surgery referral if weakness progresses or pain is uncontrolled.
- Find a nearby practice through veterinary clinic listings.
When to see a vet
Book promptly for fever with back pain, or reluctance to move that lasts more than a day. Go urgent if your dog cannot stand, drag limbs, or seems in severe pain.
Key Takeaways
- Discospondylitis is an infection of the disc and neighboring vertebrae, mainly in dogs.
- It mimics IVDD and other back diseases — imaging plus culture guide care.
- Long antibiotic courses and treating the source infection are the usual path to recovery.
FAQ
Can people catch discospondylitis from their dog?
The spinal infection itself is not contagious by casual contact. If Brucella is involved, your vet will advise specific household precautions.
How long until my dog feels better?
Pain and fever often improve within one to two weeks of the right antibiotic, but the full course is much longer to prevent relapse.
Is discospondylitis the same as a slipped disc?
No. IVDD is a mechanical disc problem. Discospondylitis is infectious and needs antimicrobial treatment.