Canine Respiratory Disease in Sheltered Dogs: Clinical Overview, Diagnosis and Treatment

Introduction 

Respiratory disease is one of the most common health problems in dogs housed in crowded environments such as shelters and pet shops. The disease is usually caused by a combination of viral and bacterial pathogens and spreads rapidly due to close animal contact and environmental stress¹. 

The most important viral causes include canine distemper virus and canine parainfluenza virus (CPIV). Common bacterial pathogens include Bordetella bronchiseptica, Mycoplasma spp., Klebsiella spp., Escherichia coli, Pasteurella spp., Streptococcus spp., Staphylococcus spp., and Pseudomonas spp². 

Clinical Signs 

Affected dogs may show¹: 

• Coughing (dry or moist) 

• Fever 

• Nasal discharge (serous to mucopurulent) 

• Lethargy 

• Anorexia 

• Dyspnea in severe cases 

Disease severity can be categorized as¹: 

• Mild: Dry cough, serous nasal discharge, normal appetite 

• Moderate: Mucous nasal discharge, mild breathing difficulty, low-grade fever 

• Severe: Mucopurulent discharge, severe dyspnea, and high fever. 

Clinical scoring systems help monitor treatment responses and prognosis. 

Diagnosis 

Clinical Examination 

Diagnosis begins with: 

• Patient history 

• Physical examination 

• Respiratory auscultation 

• Temperature monitoring 

Bronchoalveolar Lavage (BAL) 

BAL is one of the most useful and safe diagnostic methods for respiratory disease because it: 

• Provides reliable respiratory samples 

• Helps identify bacterial and fungal pathogens 

• Has low complication risk¹. 

Blood Tests 

Complete blood count often shows leukocytosis, indicating inflammation or bacterial infection. Reduction in white blood cell counts after treatment suggests therapeutic success. 

Blood gas analysis helps assess respiratory function and guides supportive therapy such as oxygen supplementation¹. 

Treatment 

Treatment focuses on three main goals: 

• Control of infection 

• Maintenance of airway patency 

• Improvement of respiratory function 

Antibiotics should ideally be selected based on culture and sensitivity testing^1,2. 

Commonly used empirical antibiotics include¹: 

• Fluoroquinolones 

• Tetracyclines 

• Trimethoprim-sulphonamides 

• Chloramphenicol. 

Supportive care such as hydration, oxygen therapy, and nutritional support is also important. 

Epidemiology 

Bacterial isolates vary by region and environment. However, the most commonly isolated bacteria in shelter dogs are: 

• Bordetella bronchiseptica 

• Mycoplasma spp. 

• Klebsiella spp. 

Environmental stress, housing density, and immune status influence disease prevalence. 

Vet Pearls 

• Always suspect mixed infections in shelter respiratory cases. 

• BAL is the best diagnostic sample for lower respiratory disease. 

• Monitor white blood cell trends to assess treatment response. 

• Early isolation of sick animals reduces outbreak spread. 

Conclusion 

Respiratory disease is a common and important health issue in shelter-housed dogs. Mixed infections involving viral and bacterial pathogens are common. Early diagnosis using clinical examination, laboratory testing, and BAL sampling improves treatment outcomes. Culture-based antibiotic therapy and supportive care are essential for successful disease management. 

Reference  

1. Köse Sİ, Maden M, Sayin Z. Clinical and bacteriological analysis of respiratory tract infections in sheltered dogs and determination of antibacterial treatment options. Journal of the Hellenic Veterinary Medical Society. 2021;72(4):3491-502. https://doi.org/10.12681/jhvms.29441  
2. Kaur J. Diagnosis and therapeutic management of canine respiratory affections. MV Sc. Thesis, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, India. 2019. https://krishikosh.egranth.ac.in/server/api/core/bitstreams/a1a37b47-79e3-42e6-a758-27abab472078/content