I have a question about my German Shepherd..?

i am a vet tech--you can do a test called cytology where the vet will aspirate the m and collect sample sells that they can send to a lab that will tell you what kind of m it is and if it should be removed...if it is not bothering her and is not cancerous then i would just leave it...but you should make sure that if you going to get the surgery done the vet does pre-anesthetic bloodwork prior to surgery, that way if your pet has any underlying issues that could cause adverse effects from anesthesia you will know before putting her under anesthesia