I had a Labrador retriever that had long cancer. I went the "keep him comfortable" route and he stayed with us for three more months.
I'm sorry and hope you have lots of quality time together.
OMG, Xan, I can't believe it!! I'm so very sorry. I remember when you adopted Wabi. She was so special from the start. Wabi and her dandelions; we even have her collar. I'm so very sorry.