Companion Animals

Dog Immune-Mediated Polyarthritis

Immune-mediated polyarthritis causes painful joint inflammation across multiple joints in dogs and requires immunosuppressive treatment for effective management.

Key Facts

Immune-mediated polyarthritis (IMPA) is the most common type of inflammatory arthritis in dogs
It can be primary (idiopathic) or secondary to infections, drugs, or other immune conditions
Affected dogs show shifting lameness, fever, lethargy, and reluctance to move
Diagnosis requires joint fluid analysis showing elevated white cell counts
Treatment with prednisolone and other immunosuppressants controls disease in most cases

Welfare Considerations

IMPA causes significant pain across multiple joints, making movement difficult and normal activities painful. The shifting lameness can make diagnosis challenging, prolonging the period of unrecognised suffering. Dogs with active disease experience significant pain and malaise. Successful immunosuppressive treatment brings rapid and dramatic relief. Long-term monitoring is required to maintain remission and minimise treatment side effects.

What You Can Do

Seek veterinary assessment if your dog shows shifting lameness or reluctance to bear weight
Ensure joint fluid analysis is performed for accurate diagnosis
Follow immunosuppressive treatment protocols carefully and monitor for side effects
Report any worsening or recurrence of signs promptly for treatment adjustment
Discuss long-term management strategies including the possibility of reducing medication once in remission