Understanding a cancer diagnosis.
You probably didn't expect to be here. This page walks through what a diagnosis actually means so you can go into your next vet visit ready to ask the right questions.
01
The biopsy result
A biopsy or cytology sample tells your vet what type of cancer cells are present. This is what determines everything downstream, which specialists to see, which scans matter, and which treatments are even on the table.
03
Stage
Stage describes how far the cancer has spread. From the original tumor only, to nearby lymph nodes, to distant organs. Staging usually involves bloodwork, X-rays or CT scans, and sometimes an ultrasound or biopsy of a lymph node.
02
Grade
Grade describes how abnormal the cancer cells look under a microscope and how quickly they tend to divide. Lower grade generally means slower-growing and less aggressive; higher grade means faster-growing and more likely to spread.
What to expect
The first two weeks
Diagnosis & staging. Your vet confirms what the cancer is (biopsy/cytology) and how far it has spread (imaging, bloodwork). This usually takes a few days to two weeks depending on lab turnaround.
Treatment plan. The oncology team lays out realistic options: surgery, chemotherapy, radiation, immunotherapy, palliative care, or some combination along with expected costs, timelines, and side effects.
Specialist referral. Many primary-care vets refer to a board-certified veterinary oncologist or surgeon at this point, especially for cancers where treatment choices are complex. See our guide to finding one.
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Second opinions & trials. It's reasonable to ask about a second opinion or whether your dog qualifies for a clinical trial before committing to a plan.
Bring this list to your next appointment
Questions worth asking
What type and grade of cancer does my dog have?
Has it spread, and how do we know?
Ask for the exact terminology used in the pathology report, you'll want it when researching or getting a second opinion.
Understand which tests were used to stage the cancer and how confident the results are.
What are all the treatment options, not just the recommended one?
What does "success" look like for this plan?
Ask about conventional therapy, immunotherapy, clinical trials, and palliative-only care, even if some aren't a fit.
Cure, remission, and comfortable time are different goals, make sure you and your care team are aiming at the same one.
What will this cost, in total?
What would you do if this were your own dog?
Ask for a realistic range across the full course of treatment, not just the next visit.
Many oncologists welcome this question. It can surface a genuine recommendation behind the list of options.