My dashund-mix dog got two lumps, one on her chest, one on her front leg
. My then vet used a regular needle-syringe to pierce and aspirate the lump
, it pulled fluid which proved to be fatty - they were lipomas (fatty tumor), not malignant. Both grew over time until the one on the leg was interfering with her walking, so I had them both removed surgically. That vet told me I should have had it done sooner, as they had stretched the skin out dramatically and made it harder to suture cleanly.