Lung Tumors

What is a lung tumor?

A lung tumor is an uncontrolled growth of abnormal cells in the lungs. Primary tumors that originate in the lungs are rare in dogs, but can be highly malignant, with the potential to spread (i.e., metastasize) to other body parts. Secondary tumors are more common, and occur when a cancer that originated in another part of the body metastasizes to the lungs. Up to 25% of dogs with lung tumors may show no early signs, or mimic bronchitis or heart failure.

What are common lung tumor signs in dogs?

Early signs include:

• Lethargy
• Exercise intolerance

Intermediate to advanced signs include: 

• Decreased appetite
• Weight loss
• Coughing or wheezing
• Labored breathing

Some dogs may not show any respiratory signs.

How are lung tumors managed in dogs?  

Management depends on whether the lung tumor is primary or secondary. For primary tumors, surgically removing the portion of affected lung is often recommended. Chemotherapy or radiation therapy can be added, or used by themselves if surgery is not an option. For secondary lung tumors, chemotherapy is the primary treatment. Discussing a personalized management plan with your veterinarian, and a veterinary oncologist, is important for the best outcome for your dog.

What is the prognosis for dogs with a lung tumor?

The prognosis depends on the tumor type and your dog’s treatment response. With the successful surgical removal of a primary tumor, and no sign of metastasis, the median survival times are 12 to 16 months. If a primary tumor has metastasized, the median survival time may be only two months. Unfortunately, secondary lung tumors also have a poor prognosis, because of the dog’s late cancer stage.

Management tips for dogs with lung tumors   

At-home needs include:

• Easy access to food and water, and a comfortable location
• Consistency with prescribed medications or supplements
• Monitoring respiratory rate and effort, gum color, appetite, and energy level
• Avoiding strenuous exercise, if directed by your veterinarian
• Room purifiers and no indoor smoking

For end-of-life care:

• Try to keep your dog safe and comfortable
• Ensure adequate nutrition and hydration
• Monitor for pain or discomfort
• Evaluate your dog’s quality of life with our scoring tool
• Track progression of their health with our calendar

In a crisis situation:

Contact your veterinarian immediately if your dog has labored breathing, or blue gums or tongue; cannot walk; collapses; or vocalizes in pain.

Before your dog‘s condition becomes unmanageable, or they begin losing their quality of life, beginning end-of-life care discussions is vital. Learn more about pet hospice, in-home euthanasia, and our teleadvice service, or contact a Lap of Love veterinarian in your area, so you can feel fully prepared for this difficult time.