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a highly contagious, acute respiratory disease of dogs, commonly consisting of laryngitis, tracheitis and bronchitis. It may be caused by any one or a combination of several viruses, bacteria and mycoplasmas. Canine parainfluenza virus, canine adenoviruses types 1 and 2, canine herpesvirus and Bordetella bronchiseptica are the most common infectious agents. Affected dogs usually have a harsh, dry cough, and occasionally fever, serous nasal discharge and lymphadenopathy. Particularly in puppies, more severe illness sometimes occurs. Called also canine infectious tracheobronchitis, rhinotracheitis.