The Missing Clue

The answer came only after the patient had died. Lola, a three-year-old female dog, arrived at the teaching hospital with bleeding gums, lethargy, and worsening respiratory distress. Laboratory results pointed toward severe inflammation, and clinicians worked to identify the underlying cause.

Hours later, after Lola succumbed to her illness and was brought back for a necropsy, her owner revealed a detail that had never been mentioned during the consultation.

Rat poison had recently been placed around the home. Suddenly, the case looked very different.

The repeated "vomiting" episodes reported by the owners were later considered more consistent with respiratory distress and air hunger than true gastrointestinal vomiting.

Clinical examination revealed:

Parameter	Finding
Heart Rate	180 bpm
Respiratory Rate	60 bpm
Mentation	Dull
Mobility	Reluctant to move
Oral Examination	Gingival bleeding and lacerations behind molars
Respiratory Exam	Wheezing over the right caudal lung field
General Condition	Depressed and reluctant to move

A CBC demonstrated marked leukocytosis, severe neutrophilia, and monocytosis, and mild anaemia, suggesting a significant inflammatory process.

"The most important diagnostic clue wasn't in the laboratory results—it was in the history that wasn't provided."

The Initial Thinking

Based on the information available at presentation, clinicians considered:

• Severe infection

• Aspiration pneumonia

• Systemic inflammatory disease

• Septicaemia

The oral wounds and blood-stained saliva also raised concern for aspiration of blood into the respiratory tract.

Thoracic radiographs were planned but could not be performed before the patient's deterioration.

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The Diagnostic Challenge

Several findings complicated the interpretation:

Findings Supporting Infection

• Severe inflammatory leukogram

• Respiratory signs

• Pulmonary involvement

Findings Supporting Haemorrhagic Disease

• Gingival Bleeding

• Blood-stained saliva

• Mild Anaemia

• Progressive Respiratory Compromise

What the Necropsy Revealed

Post-mortem examination showed:

• Severe pulmonary haemorrhage

• Pulmonary oedema

• Frothy blood within the trachea

• Extensive involvement of multiple lung lobes

• Evidence suggestive of gastrointestinal bleeding

These findings supported a severe systemic haemorrhagic process leading to respiratory failure.

The Missing Piece

Immediately before necropsy, the owner disclosed that rat poison had recently been placed throughout the home. This information had not been mentioned during the clinical consultation. Although toxicological testing was not performed, the combination of gingival bleeding, anaemia, pulmonary haemorrhage, gastrointestinal bleeding, and respiratory failure made anticoagulant rodenticide toxicity an important differential diagnosis.

Lessons from Lola

1. History Matters

Even sophisticated diagnostics cannot replace a complete and accurate history.

2. Ask About Environmental Exposures

Specific questions about rodenticides, pesticides, and household chemicals may uncover critical information.

3. Respiratory Signs Can Mask Haemorrhagic Disease

Pulmonary haemorrhage may initially resemble primary respiratory disease

4. Owners Don't Always Recognise What Is Clinically Significant

What seems insignificant to a client may be the key to diagnosis.

Every veterinarian has experienced a case where the diagnosis became clear only after one crucial detail emerged. Lola's story reminds us that successful diagnosis depends not only on clinical expertise but also on effective communication between clinicians and animal owners.