Just got back from the vet. It is what I feared it was. Because I don't believe in taking extreme measures to prolong a life, he has maybe 2 months. I was worried I'd need to put him to sleep next week, but the vet said he seems to be doing OK for now. We'll start giving him steroids next week. Should help keeping him comfortable for the time he has left. I feel a sense of relief and sadness. Glad I know that his time is short and I can do things for him to make that time better, sad to lose him. He's such a good dog and he deserved a better parent than me. He was a rescue, so might not have had any life had I not taken him, but wow do I feel like I've let him down. And let myself down. What kind of parent am I? Terrible.