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Vetdle Archive

Archive Case #223: Canine Bacterial Endocarditis

Dog veterinary case - Hard - October 12, 2026

Clinical Clues

  1. An adult dog returns after several weeks of intermittent fever, fatigue and shifting limb discomfort.
  2. Joint examination finds pain but no single persistent swollen joint; the dog has lost weight since its first visit.
  3. A new left-sided heart murmur is heard, prompting cardiac investigation alongside the fever work-up.
  4. Blood cultures collected during the febrile illness grow the same bacterial species in separate samples.
  5. Echocardiography shows a mobile, irregular mass attached to an aortic valve cusp with new regurgitation.
  6. The combination of repeated bacteremia and an infected-appearing valve vegetation supports bacterial endocarditis in this dog.

Diagnosis

Canine Bacterial Endocarditis

The new murmur, repeated positive blood cultures and a valvular vegetation with regurgitation support bacterial endocarditis. Immune-mediated polyarthritis can cause shifting pain and fever but does not explain this valve lesion with bacteremia; a sterile thrombotic vegetation would not explain the repeated matching cultures. Remember: A changing murmur in a febrile dog warrants cardiac investigation; blood cultures and echocardiography together carry more weight than lameness alone.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this dog case supports the provided diagnosis, Canine Bacterial Endocarditis, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: An adult dog returns after several weeks of intermittent fever, fatigue and shifting limb discomfort.
  2. Clue 2: Joint examination finds pain but no single persistent swollen joint; the dog has lost weight since its first visit.

Clues 3-4

  1. Clue 3: A new left-sided heart murmur is heard, prompting cardiac investigation alongside the fever work-up.
  2. Clue 4: Blood cultures collected during the febrile illness grow the same bacterial species in separate samples.

Clues 5-6

  1. Clue 5: Echocardiography shows a mobile, irregular mass attached to an aortic valve cusp with new regurgitation.
  2. Clue 6: The combination of repeated bacteremia and an infected-appearing valve vegetation supports bacterial endocarditis in this dog.

Self-review prompts

  1. After clues 1-2, what evidence from this dog case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Canine Bacterial Endocarditis?
  3. How do clues 5-6 align with the case explanation for Canine Bacterial Endocarditis?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.