Thoracic & Lung Conditions in Dogs & Cats
The chest houses the lungs, heart, major blood vessels, and lymph nodes — all structures that can be affected by tumors, infections, or structural abnormalities. When pets present with coughing, labored breathing, or exercise intolerance, a thorough look inside the thorax is essential for identifying the cause.
At Sage Veterinary Imaging (SVI), our 128-slice CT scanner captures high-resolution images of the entire chest in seconds, revealing lung nodules, masses, pleural disease, and vascular abnormalities that standard X-rays may miss or underestimate. CT is the gold standard for thoracic imaging in veterinary medicine, providing the three-dimensional detail needed for accurate staging, surgical planning, and treatment monitoring.
SVI offers advanced CT imaging at our centers in Round Rock, Texas; Spring, Texas; and Sandy, Utah.
Common Thoracic Problems We Diagnose
Thoracic conditions can be subtle on standard X-rays, where overlapping structures make it difficult to see small nodules, distinguish masses from fluid, or assess vascular anatomy. CT eliminates this ambiguity. Below are the thoracic conditions our team most often helps identify.
Lung Nodules & Masses
Primary lung tumors in dogs and cats can grow silently for months before causing clinical signs. CT is far more sensitive than X-rays for detecting small lung nodules — often identifying lesions as small as 1–2 mm that radiographs would miss entirely. This early detection is critical for surgical planning, as solitary lung masses caught early often have a favorable prognosis with lobectomy. CT also characterizes the mass location, vascular involvement, and lymph node status to guide treatment decisions.
Learn more about lung masses →Mediastinal Tumors
The mediastinum — the central compartment of the chest between the lungs — can harbor tumors that compress the airways, esophagus, or major blood vessels. Mediastinal lymphoma is common in cats, while thymoma and heart base tumors are seen more often in dogs. CT provides precise detail about mass size, tissue characteristics, and relationship to surrounding structures, which is essential for determining whether surgical resection, chemotherapy, or radiation is the best approach.
Learn more about mediastinal tumors →Tracheal Collapse & Airway Disease
Tracheal collapse is one of the most common causes of chronic coughing in small-breed dogs, particularly Yorkies, Pomeranians, and Chihuahuas. While standard X-rays can show severe collapse, CT captures the trachea in cross-section throughout its entire length, grading the severity at each level and identifying concurrent bronchial collapse that may affect treatment decisions. Dynamic CT studies can even capture changes between inspiration and expiration, providing a complete picture of airway function.
Learn more about tracheal collapse →Pleural & Chest Wall Disease
Fluid or air in the pleural space can compromise breathing and may indicate underlying conditions ranging from heart disease to cancer. CT differentiates between types of pleural disease, identifies the source of fluid accumulation, and reveals chest wall masses or diaphragmatic hernias that X-rays may only hint at. For pleural effusion cases where the underlying cause is unclear, CT-guided sampling can target specific areas for the most diagnostic yield.
Learn more about pleural disease →Pulmonary Metastasis Screening
When a pet is diagnosed with cancer elsewhere in the body, screening the lungs for metastatic spread is a critical part of staging. CT detects pulmonary metastases at a much earlier stage than chest X-rays — studies show CT identifies significantly more nodules than standard three-view radiographs. This information directly impacts treatment decisions: detecting metastatic disease before surgery can change the entire treatment plan, potentially sparing pets from unnecessary procedures.
Learn more about metastasis screening →Breeds Commonly Affected
Thoracic conditions affect all breeds, but certain breeds carry higher risk for specific problems. Yorkshire Terriers, Pomeranians, and Chihuahuas are predisposed to tracheal collapse. Labrador Retrievers, Golden Retrievers, and German Shepherds have higher rates of primary lung tumors. Boxers are prone to thymoma and heart base tumors. Siamese and Oriental Shorthair cats have higher rates of mediastinal lymphoma. Large and giant breeds like Great Danes and Irish Wolfhounds are predisposed to cardiac and thoracic conditions.
How CT Imaging Helps
CT is the imaging modality of choice for thoracic evaluation because it eliminates the superimposition problem inherent in chest X-rays. Where radiographs stack all thoracic structures into a single flat image, CT captures each slice individually — allowing radiologists to evaluate the lungs, mediastinum, pleural space, and chest wall without overlap. Our 128-slice scanner completes a full thoracic study in under 5 minutes.
Each study is reviewed by our board-certified veterinary radiologists, who provide a detailed report and work directly with your veterinarian to plan the most appropriate next steps.
What to Expect During Your Visit
Thoracic CT scans are among the fastest imaging studies we perform — the actual scan takes less than 5 minutes. Your pet will be placed under brief general anesthesia to ensure they remain still and to control breathing motion for optimal image quality. In many cases, contrast-enhanced images are also obtained to better characterize masses and evaluate blood vessels. The entire visit typically takes about an hour.
Results are interpreted by a board-certified veterinary radiologist, and your veterinarian typically receives a detailed report the same day.
Learn more about veterinary CT at Sage →Why Choose Sage Veterinary Imaging
Get Answers for Your Pet
If your pet has a persistent cough, labored breathing, or has been diagnosed with cancer that may have spread to the chest, advanced CT imaging can reveal what standard X-rays cannot and help your veterinarian determine the best path forward.
Schedule a Diagnostic CT Scan
Visit one of our three locations to learn more and schedule your pet’s thoracic imaging study. Our team will work directly with your veterinarian to ensure the right study is performed.
Thoracic Imaging FAQ
Ready to Get Answers?
Advanced thoracic CT imaging can reveal the cause of your pet’s respiratory symptoms or provide critical staging information for cancer treatment. Visit one of our locations to get started.