Dog Immune-Mediated Haemolytic Anaemia

Immune-mediated haemolytic anaemia (IMHA) is a serious and potentially life-threatening condition in which a dog's immune system destroys its own red blood cells, causing severe anaemia and distress.

Key Facts

IMHA is one of the most common immune-mediated diseases in dogs
Cocker Spaniels, Springer Spaniels, Poodles, and Bichon Frises are predisposed breeds
Destruction of red blood cells causes pallor, lethargy, rapid breathing, and collapse
Jaundice from haemoglobin breakdown gives skin and mucous membranes a yellow tinge
Blood transfusions may be required as a life-saving bridge to immunosuppressive therapy
Thromboembolic complications are a major cause of death in IMHA, requiring anticoagulant treatment
Relapse occurs in 10-30% of dogs after apparent recovery, requiring long-term monitoring

Welfare Considerations

IMHA causes profound suffering — severely anaemic dogs experience extreme lethargy, breathlessness, and weakness. The rapid onset of severe anaemia can be disorienting and frightening for affected animals. Hospitalisation for blood transfusions and intensive monitoring is stressful, particularly for anxious dogs. Immunosuppressive treatment with high-dose steroids causes side effects including increased thirst, hunger, and urination that are uncomfortable in their own right. The risk of potentially fatal pulmonary thromboembolism adds a layer of ongoing critical vulnerability during treatment. Despite these challenges, many dogs with IMHA respond well to treatment and return to excellent quality of life, making prompt diagnosis and aggressive initial management life-saving.

What You Can Do

Seek emergency veterinary care immediately if your dog shows pale gums, extreme weakness, or rapid breathing
Ensure your vet checks for IMHA in any dog presenting with unexplained anaemia
Follow medication tapering schedules precisely — stopping steroids too quickly risks relapse
Monitor your dog closely for recurrence of pale gums or lethargy after treatment ends
Consider pet insurance to cover the significant costs of IMHA hospitalisation and ongoing treatment