Steroid-responsive meningitis-arteritis (SRMA) is an immune-mediated inflammatory disease affecting the meninges and arteries of the spinal cord and brain in dogs, causing severe neck pain, fever, and reluctance to move. Young large-breed dogs are most affected, and the condition responds dramatically to corticosteroids when caught early.
Last reviewed: June 2026
What Is Steroid-Responsive Meningitis-Arteritis?
Steroid-responsive meningitis-arteritis is an immune-mediated condition — not infectious — in which the dog's own immune system attacks the meninges (membranes covering the brain and spinal cord) and associated blood vessels, causing intense inflammation. SRMA is the most common inflammatory CNS disease in dogs in many parts of the world.
As described in Ettinger's Textbook of Veterinary Internal Medicine, the classic presentation is acute severe cervical pain in a young large-breed dog with accompanying fever and generalized stiffness. Beagles, Bernese Mountain Dogs, Boxers, and Nova Scotia Duck Tolling Retrievers have reported predispositions, though any breed can be affected. Age of onset is typically 6 months to 2 years.
Signs of SRMA
Acute SRMA signs:
- Severe neck stiffness and pain — the hallmark; dogs hold the neck rigid, resist lowering the head to eat or drink, and may cry out when the neck is touched
- Reluctance to walk or move — hunched posture or refusal to descend stairs
- High fever (39.5–41 °C / 103–106 °F) — frequently accompanies the acute episode
- Generalized stiffness — all limbs may appear stiff with a "sawhorse" posture
- Depression and lethargy — most dogs appear clearly unwell
Tipold & Schatzberg, 2010, JVIM confirmed that CSF pleocytosis with marked neutrophilic inflammation is the diagnostic hallmark, with most dogs showing complete response to immunosuppressive corticosteroid therapy.
Diagnosis
- Physical and neurological exam — identifies cervical pain, fever, and posture abnormalities
- Blood work — CBC shows neutrophilia; elevated C-reactive protein (CRP) correlates with disease activity
- MRI — rules out structural causes of neck pain; may show meningeal enhancement
- CSF analysis — the key diagnostic test; marked pleocytosis with predominantly non-degenerate neutrophils and elevated protein
- Infectious disease screening — CSF and serum panels for tick-borne and fungal pathogens to exclude infectious meningitis before immunosuppression, as described in Greene's Infectious Diseases of the Dog and Cat
Treatment
- Prednisolone — started at immunosuppressive doses, then tapered slowly over 6+ months based on clinical response and serial CRP monitoring; premature tapering is the most common cause of relapse; the AAHA Pain Management Guidelines, 2022 recommend multimodal analgesia during the acute phase while immunosuppressive treatment takes effect
- Combination immunosuppression — azathioprine or mycophenolate added if needed
- Prognosis — excellent when treated in the acute phase; the majority achieve sustained remission
When to See a Vet
Call your vet today if:
- Your dog is holding its neck rigidly and resists moving its head up or down
- Your dog seems painful when touched along the neck or back
- Your dog appears stiff in all limbs and is reluctant to walk normally
- Your dog has a fever alongside the above signs
Go to the ER immediately if:
- Your dog cannot walk or has collapsed
- Your dog is crying out in severe pain and cannot be comforted
- You notice weakness or loss of coordination in the legs alongside neck pain
- Pain is worsening rapidly over hours
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Frequently Asked Questions
How do I know if my dog has SRMA versus a slipped disc? Both cause neck or back pain and movement reluctance, but SRMA almost always includes fever and is most common in young large-breed dogs aged 6 months to 2 years. IVDD more commonly affects middle-aged dogs and chondrodystrophic breeds such as Dachshunds and French Bulldogs. Definitive distinction requires CSF analysis and imaging — a vet visit is necessary for severe pain.
Is SRMA contagious? No — SRMA is immune-mediated, not caused by an infectious pathogen. It cannot spread between dogs or to people. Ruling out infectious meningitis before starting immunosuppressive treatment is important, which is why CSF testing and infectious disease panels are part of the standard workup.
How long does steroid treatment last for SRMA? Treatment typically lasts a minimum of 6 months, with the dose tapered gradually based on clinical improvement and CRP monitoring. Many dogs are maintained on low-dose prednisolone for 9–12 months before a full taper. Stopping treatment too early is the most common cause of relapse.
How much does SRMA diagnosis and treatment cost? Initial exam and blood work runs $150–400. MRI costs $1,500–3,000 at a referral center. CSF analysis adds $400–700. Prednisolone is inexpensive at $20–60 per month at maintenance doses. Total first-year costs including diagnostics and monitoring typically range from $2,500–5,000.
Can SRMA recur after treatment is stopped? Yes — relapse occurs in approximately 20–30% of dogs after completing the initial treatment course. Dogs that relapse are restarted on immunosuppressive doses and tapered more slowly on the second course. Serial CRP monitoring helps detect early relapse before clinical signs return.
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