My 8 y/o retriever/lab mix has not been eating for a few days now. We've tried giving her different options, but she just won't eat for us. She also has a bit of a swollen stomach and is wheezing a bit. My husband and I are confident this is NOT bloat. However, we have no idea what else it could be. We had some blood work done a week ago and everything came back normal. Any ideas?