Only after it has a name. Confirmed benign lumps that are small and out of the way can be watched. Confirmed malignant lumps almost always do best with early, well planned removal. Unnamed lumps need the needle test before anyone books an operation or promises watch and wait is safe.
The same tumour is a small operation this month and a limb threatening one next year. Location is destiny: on the flank there is spare skin to give; on a lower leg there is none. This is why surgeons push to remove confirmed malignancies promptly and completely the first time. Second surgeries through scarred, irradiated or regrown tissue are harder, dearer and less likely to cure.
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Some tumours, mast cell tumours notably, swell and shrink with histamine release. A lump that fluctuates is showing personality, not innocence. Fluctuation is a reason for the needle, not against it.
Age is a number; anaesthetic risk is an assessment. For a comfortable senior dog with a resectable malignancy, removal can prevent a miserable final year. For others, comfort focused care is the kind answer. This is exactly the conversation an independent opinion can referee honestly.
An independent written opinion on the diagnosis, the technique and the quote. From $250.