26 A 4-year-old terrier cross dog presents with a complaint of reduced exercise tolerance and harsh coughing. These signs have been present for approximately 2 months and were initially attributed to canine infectious tracheobronchitis after a boarding kennel stay. The owner reports that the dog coughs frequently during the day and often there is gagging, retching, and swallowing behavior after the cough. Occasionally, the dog will cough up a yellow-green material. On physical examination you note dyspnea with increased lung sounds diffusely across the lung fields and the lung sounds are predominantly wheezing in nature. Lateral and dorsoventral radiographs of the dog’s thorax are provided (Figures 26.1 and 26.2). https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429401725/fe6fa303-c714-41e4-95cc-94c10c7f2fd1/content/fig26_1_C.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/> https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429401725/fe6fa303-c714-41e4-95cc-94c10c7f2fd1/content/fig26_2_C.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>

i. How do you interpret the radiographic changes in this dog? What pattern of lung density do you see?

You conduct a bronchoscopic examination and observe large amounts of thick, yellow-green mucus adherent to thickened bronchial mucosa. A bronchoalveolar lavage sample contains >50% eosinophils; no infectious agents are seen.

ii. What is eosinophilic bronchopneu-mopathy?

iii. What, if any, breeds are predisposed to this condition?

iv. What underlying disorders may be associated with eosinophilic bronchial infiltration?

v. How would you plan to treat this dog?