FieldDxWatery Mouth of LambsClinical signs, differential diagnosis, treatment and prevention in sheep.
Overview
A neonatal lamb condition of drooling and gut stasis in the first days of life. Associated with gram-negative bacteria, particularly E. coli, translocating from the gut to the bloodstream; exact pathophysiology not fully confirmed.
Clinical signs
- Wet muzzle and excess salivation in obvious cases; in milder cases the mouth may be cold to the touch with frothy saliva and no visible drooling.
- Abomasum distended with gas and fluid — gently lifting and shaking the lamb produces a splashing sound ("rattle belly"), giving the deceptive appearance of a well-fed lamb.
- Occurs in the first days of life; no confirmed pathognomonic sign, so diagnosis stays clinical.
Predisposing factors
- Mainly lambs 24-72 hours old; the root cause is typically inadequate colostrum intake.
- Twin and triplet lambs are more often affected.
- Lambs born to ewes in poor body condition are at higher risk.
- Low serum total-protein (ZST) results indicate failure of passive transfer.
Treatment
- Maintain hydration with small, frequent feedings of milk or milk replacer.
- Systemic antimicrobial therapy with Gram-negative coverage (e.g. amoxicillin-clavulanate) plus NSAIDs or corticosteroids to counter endotoxemia; early detection and aggressive supportive care are key.
Drugs mentioned: Amoxicillin/Clavulanate Amoxicillin
Prevention
1. In outbreaks, improve hygiene and neonatal care to prevent failure of passive transfer. 2. Prophylactic antibiotics for watery mouth are called inappropriate. 3. Flocks have cut oral antibiotic use by improving hygiene, colostrum management and ewe nutrition.
Source
SRUC (Scotland's Rural College) Veterinary Services — How to Diagnose Watery Mouth in Lambs, 10 April 2025 (accessed 2026-10-29)
MSD Veterinary Manual — Intestinal Diseases in Sheep and Goats (accessed 2026-08-11)
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