Struggling

It finally hit time for my little lady. She's a dogo argentino, 15 years old. I got her when she was less than 6 months old from some breeder 4 hours away from me. When I drove home she slept in the palm of my hand, and from that day she's been my little princess. Two days ago I got the news she's got lung cancer and a few months to live. I'm really struggling with the news. I was 18 when I got her , and here I am 33 about to turn 34 next week still with her in my life and I'm not sure how much longer ... it hurts so bad.