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I am sorry to hear about Humphrey having this mass. My name is Rebecca. I am a veterinarian and will do my best to help.
How big is it, in inches? How long has it been there? Can you post a picture of it?
The only way to know what any mass is and if it is cancer, is to do some kind of biopsy. I usually start with FNA, fine needle aspiration, which is putting a small sterile needle into the mass to get cells to look at under a microscope. If the FNA shows any cancer cells, I would remove the mass ASAP.
Let me know what else I can answer or help with.
I hope you could see my answer. Can I help with or answer anything else?