NAVLE Respiratory

Canine Pneumonia Study Guide

Pneumonia is inflammation of the pulmonary parenchyma (small airways, interstitium, and alveoli) that results in respiratory disturbance and is a common clinical diagnosis in dogs.

Overview and Clinical Importance

Pneumonia is inflammation of the pulmonary parenchyma (small airways, interstitium, and alveoli) that results in respiratory disturbance and is a common clinical diagnosis in dogs. Pneumonia can be caused by aspiration of gastric contents, bacteria, viruses, fungi, parasites, or protozoa. Understanding the different types, diagnostic approaches, and treatment modalities is essential for the NAVLE, as pneumonia-related questions frequently appear in the exam.

The prognosis for bacterial and aspiration pneumonia is generally good with appropriate treatment, with reported survival rates of 77% to 88%. However, fungal pneumonias require prolonged treatment courses and have more variable outcomes depending on the extent of disease.

Type Common Pathogens Key Features
Bacterial Bordetella bronchiseptica, E. coli, Pasteurella spp., Streptococcus spp., Staphylococcus spp., Mycoplasma spp. Often secondary to viral infection; cranioventral distribution; common in young dogs in shelters/boarding
Viral Canine distemper virus, Canine influenza virus, Parainfluenza virus, Adenovirus types 1 and 2 Predisposes to secondary bacterial infection; bronchointerstitial to alveolar pattern; often self-limiting
Aspiration Secondary bacterial infection with enteric organisms, Pasteurella, anaerobes Associated with megaesophagus, vomiting, anesthesia; right middle lobe commonly affected
Fungal Blastomyces dermatitidis, Histoplasma capsulatum, Coccidioides immitis Geographic distribution; chronic course; miliary or nodular pattern; hilar lymphadenopathy
Parasitic Filaroides spp., Aelurostrongylus spp., Paragonimus spp., Angiostrongylus vasorum Eosinophilic inflammation; patchy bronchointerstitial pattern; diagnosed via Baermann or BAL

Classification of Canine Pneumonia

Pneumonia in dogs is classified by etiology. Understanding the different types is critical for appropriate diagnosis and treatment.

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