Aww, I'm sorry about your dog. It just sounds so bad, doesn't it? Tumour. I don't know if it's cancerous and spreading elsewhere, but it's getting big and she's losing a lot of weight (in the past year she's lost a kilo, and considering she was only 5kg to begin with...).
I guess it's all about making the most of the time we have left. I cuddled with her in bed for about half an hour this morning and she drooled all over my arm :)