A. This is not normal. It may be mammary cancer or benign, non-cancerous growths or cysts. I would recommend that you have a vet examine her. A sterile needle aspirate can be done to get a sample of the cells in the mass to get a better idea if it is cancer or not. It is often recommended to surgically remove these masses and spay her at the same time. Your vet may recommend bloodwork and a chest x-Ray first.
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