Bladder Worm and Coenurosis in Sheep: Welfare Implications
Coenurosis (gid) caused by Taenia multiceps tapeworm larvae causes fatal neurological disease in sheep, with significant welfare and management implications.
Key Facts
- Caused by larvae of the dog tapeworm Taenia multiceps encysting in the sheep brain
- Produces progressive neurological signs: circling, head tilt, blindness, and recumbency
- Fatal in most affected animals within weeks to months if untreated
- Surgical removal of the cyst is possible but requires specialist skill
- Prevention requires effective tapeworm control in farm dogs and working dogs
Welfare Considerations
Coenurosis creates severe welfare suffering through progressive neurological deterioration. Affected sheep circle compulsively, press their heads against objects, become blind, and eventually become recumbent and unable to feed or drink. The condition has a poor prognosis without surgery, and surgery carries significant risk and cost. Early euthanasia of severely affected animals is often the kindest welfare option. Prevention through regular tapeworm treatment of farm dogs is highly effective and represents the most important welfare interventionāeliminating the disease before it occurs.
What You Can Do
- Treat farm and working dogs regularly with praziquantel tapeworm treatment
- Do not allow dogs to eat raw sheep offal containing potential cysts
- Monitor sheep regularly for early neurological signs
- Euthanize severely affected sheep promptly to prevent prolonged suffering
- Consult your vet about surgical options for valuable animals with early-stage disease