Nasal diseases of chronic nature are a common clinical complaint in canine practice. However, precise diagnosis in these cases is often difficult and require the use of various, additional diagnostic methods. The aim of this study was to estimate the occurrence of diseases of the upper respiratory tracts in dogs, and to evaluate the usefulness of endoscopy in the diagnostic process as a method of obtaining a final diagnosis. In the group of dogs in which rhinoscopy was performed, the most common final diagnoses were nonspecific chronic rhinitis, followed by neoplasms and infectious rhinitis. It can be concluded that rhinoscopy should be considered mainly as a preliminary method of inspection of the nasal cavity, helpful in obtaining the most representative tissue specimen/specimens for histopathology. In some cases, especially foreign objects and congenital abnormalities rhinoscopy can give the possibility of obtaining a final diagnosis. However, even in these situations and also when any macroscopic lesion is found during endoscopy, microscopic examination of the mucosa specimen should be performed.
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