I'm so sorry that happened! I'm glad he saved your dog. Try not be so hard on him for his coldness. That is who he is. That is the face he shows the world, and it is his safety mechanism. The aberration is that you ever saw him any other way. I'm sure he told his staff nothing about you, except that he had moved out a while back. They don't know the story, so they don't know what to do. As long as he doesn't bill you for the surgery, he's not treating you like any other patient.
Send him a damn card for his birthday and write thank you for being there for the dog on it. I guess I wouldn't acknowledge the anniversary. I don't know if they count at a time like this. You say this every time -- the more you see him the more you dislike him. Do you forget in between visits? Probably. You have an idea of who he is in your head, but that person is gone. Just as my little children are gone and replaced by young adults. No matter how I try to call back the little boy who fought to sit in his mother's lap and kiss her, I get a surly, cursing 24 year old who only visits when he wants money. Life is change. If we don't accept that and move on we risk damaging ourselves.