I'm sorry to hear about your dog. You know that you did the right thing and you should feel good about that.
I have a rule about pouting and not talking to me at my house. If you are mad at me, you have to tell me what is wrong; otherwise, it is totally not my fault. If my DH gets all sulky, I ask him once what is wrong. If there is no answer, I totally ignore the behavior. It took 30 years, but I finally got him trained to either tell me what is wrong and give me a chance to address the problem, or to forget about changing anything that I do.