Cattle Illness: Understanding Frothy Mouth & Potential Causes

Frothy salivation (ptyalism) in cattle is a non-specific sign of distress. It requires urgent veterinary investigation as it can indicate life-threatening conditions.

Major Differential Diagnoses

1. Bovine Spongiform Encephalopathy (BSE - "Mad Cow Disease")

• Prion disease; progressive neurological degeneration.
• Signs: apprehension, ataxia, tremors, aggression, hyperesthesia, difficulty rising.
• No treatment; fatal. Reportable disease. Zoonotic risk (vCJD in humans).

2. Rabies

• Lyssavirus; acute encephalitis.
• Signs: behavioral change, hypersalivation, dysphagia, paralysis, aggression.
• Fatal once clinical. Vaccinate preventively. Reportable.

3. Choke (Esophageal Obstruction)

• Common cause of acute frothing. Feed bolus lodges in esophagus.
• Signs: excessive salivation, nasal discharge (feed material), retching, distress.
• Emergency: sedate, pass stomach tube, lavage. Prevent aspiration pneumonia.

4. Toxicities

• Organophosphates/Carbamates: SLUDGE signs (salivation, lacrimation, urination, defecation, GI upset, emesis). Atropine antidote.
• Lead: Paint, batteries. Blindness, seizures, frothing.
• Plant Poisons: Oleander, bracken fern, cyanogenic plants.

5. Other Causes

• Actinobacillosis ("wooden tongue") – granulomatous tongue lesion.
• Foot-and-Mouth Disease – vesicles, salivation, lameness (reportable).
• Bloat (ruminal tympany) – distension, dyspnea, frothing.
• Dental disease, oral trauma, foreign body.

Action

Isolate the animal. Call a veterinarian immediately. Note onset, herd history, feed changes, and environmental exposures. Do not handle saliva without gloves (rabies risk).