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I am sorry to hear you are worried about these lumps on Jenney. Many lumps on older dogs are not serious; they can be benign cysts, fatty tumors, or adenomas. The only way to tell what any lump is however, is to test them by FNA: fine needle aspiration, using a needle to get cells from the lump to look at under a microscope. You can't tell what a lump is by looking at it or feeling it.
The lumps I worry about are ones that grow quickly, bleed, or bother the dog so the one that is sore to the touch should be checked out.
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