Thank you for your concern
I thought about sending it to pathology but .... I'm not sure what would change.
Libby is still failing - she still has trouble breathing and something about eating and drinking "hurts". The expulsion of that tissue only really helped her breathing for one day. And, I am somewhat worried her lungs are now involved.
Yes, it would be interesting to know what it is - but, I don't know if the cost and the answer would change our current treatment. I am not in a position to spend a lot of money on a fourteen year old dog and my vet is very understanding. I asked for a chest x-ray the last time I took her in - and the vet very calmly asked "what would that change?" (also - Libby is very sensitive to anesthetics)
At this point - Libby can't be cured. I can only try and make her last days as comfortable as I can.
Thank you for your understanding - I wish the best for you and your pal.