Companion Animals

Equine Sarcoids: Welfare Management of the Most Common Horse Tumour

Equine sarcoids are the most common skin tumour in horses, causing welfare impacts from irritation, secondary infection, and interference with tack and harness.

Key Facts

Sarcoids are locally invasive fibroblastic skin tumours associated with bovine papillomavirus
They affect all horse breeds but certain MHC types confer increased susceptibility
Clinical forms include flat, verrucous, nodular, fibroblastic, mixed, and occult types
Treatment options include surgical removal, cryotherapy, laser therapy, and immune-based treatments
Recurrence following treatment is common, particularly with incomplete surgical excision

Welfare Considerations

Sarcoids cause welfare impacts primarily through their location: periocular sarcoids impair vision; sarcoids under the girth or saddle area cause pain under tack and prevent work; sarcoids at the groin or between hindlimbs cause chafing and prevent normal movement. Secondary infection following self-trauma causes pain and systemic illness. The psychological impact on horse welfare of repeated painful treatment attempts must also be considered in management planning.

What You Can Do

Seek veterinary assessment for any new or changing skin lesions on your horse
Choose treatment modality based on sarcoid type, location, and welfare impact
Ensure tack is adjusted to avoid pressure on sarcoid-affected areas
Consider quality of life in treatment decisions when sarcoids are multiple or recurrent
Monitor treated sites for recurrence as early re-treatment is more effective than waiting