When to Worry and When to Watch
It is one of the most common things I hear in an exam room: “I found this bump while petting her.” Discovering a lump on your dog or cat can be unsettling. The good news is that many masses are benign. The harder truth is that some are not. The key is knowing when to monitor and when to act.
Lumps and bumps become more common as pets age. Fatty tumors called lipomas are frequently seen in middle aged and senior dogs. We also see cysts, skin tags, and other benign growths. At the same time, malignant tumors such as mast cell tumors and soft tissue sarcomas are part of veterinary medicine as well. Unfortunately, it is impossible to know what a mass is just by looking at it or feeling it.
What we learn during the exam
Even before any testing, an exam gives us valuable information. We consider the size, location, texture, and how quickly the mass appeared. We discuss likely differentials and talk through what is most concerning and what is less so. We also measure the mass and document it carefully so we can objectively track change over time. Having a baseline measurement in the medical record is far more reliable than memory alone.
Sampling and biopsy options
One of the most common next steps is a fine needle aspirate. Using a small needle, similar to what we use for vaccines, we collect cells from the mass and examine them under a microscope. This is quick, minimally invasive, and often gives helpful answers.
Sometimes an aspirate does not provide enough information. In those cases, we may recommend removing the entire mass and sending it to a pathologist. This is called an excisional biopsy. For smaller, easily accessible masses, this can both treat the issue and give us a definitive diagnosis at the same time.
In select situations, especially if we are concerned about certain tumor types such as oral tumors or sarcomas, we may recommend an incisional biopsy. That means taking a small sample first to confirm what we are dealing with before planning a more extensive surgery.
When monitoring is reasonable
Some owners elect to monitor a mass rather than sample it right away. That decision can be reasonable, especially when balancing costs and when the mass appears low risk. The important part is understanding that we cannot know for certain what a mass is without testing. Monitoring does carry risk.
If we choose to watch it, we do so intentionally. We record measurements, set expectations for what changes would concern us, and schedule rechecks as needed. Growth, redness, ulceration, or any new discomfort should prompt a re-evaluation.
Why early action matters
When a mass turns out to be malignant, early detection makes a meaningful difference. Surgery is simpler when tumors are small. Recovery is often easier for the pet, and costs are typically lower than when we wait for a mass to enlarge. In some cases, earlier removal may also reduce the risk of spread.
If you would like to learn more about how we approach mass and tumor removal, you can visit www.nimbuspet.com/mass-tumor-removal.
Finding a lump does not automatically mean cancer. But it does mean it deserves attention. The earlier we evaluate it, the more options we have and the better positioned we are to make thoughtful decisions for your pet.
