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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. Thank you for your question. Your bet has presented a very good recommendation as far as removing the mass / growth. This will get sufficient tissue from it to send in for histoapthology to determine what it is and if further action is needed. It may be something that isn't easily "biopsied". To be honest, surgical removal is pretty much done rather than biopsy of a mass. The one thing that I would consider here is doing a fine needle aspirate if it first and seeing if some cells are obtained to tell what it is and if a more aggressive surgery is needed. Sometimes fine needle aspirates don't give an answer as to the origin. Before a surgery on this, given his age I would recommend blood work to make sure there are no other issues. It is good that so far this growth isn't bothering her. Hopefully it is a benign lesion.