[vic and max]

Hi My Max has been diagnosed with Sarcoma,which was determined by a cell/blood test ,. She is 9 years old, recoverd from a battle with parvo @2 yrs, and is the most amazing animal in the world . She has a lump in her front right shoulder . The vet would like to put her under anethstetic to get a tissue sample to better dtermine our course of action

1-I am unsure why we need to to that ,would it not be wiser to just remove when she is under anethstetic? or plan a course of action now,why more test .She really gets stressed out and so do I with repeat visit to the vets

2-I f I don't and just keep giving her Mdican for pain , she eats and chases skunks ,she limps , but what will happen ?

3- What are her chances is and timeline if we do act , or do not ?

I love my animal almost as much as she love me , I never had a dog up until she stepped into my life , the thought of not having her breaks my heart a t the same time I would like to know /honest opinions, if any one has experienced this before ,please any input would be appreciate

Love Vic and Maxi