Hey Texas! I am so heartbroken for you. Kasey looks like such a sweet dog. I have an australian shepherd. They are such "lovers". And you're right, they never complain. My Cassie had a "growth" on her behind, so we took her to A & M to see what they could do. That turned out to just be a benign tumor that they removed, but found a breast tumor while there. They were able to remove it too. At least they showed me how to check our dogs breast. It was about the size of a BB. I would have never known what it was or worried about it.
Blessing to you.