My beautiful little buddy, "MAX", a 10 year old Shih-Tzu, has had a heart murmur since a pup. Now, he's developed an atrial fibrilation on top of the murmur. His little heart is beating 300 beats per minute, should be 120. He's on 3 meds to try to re-regulate his heart back to 120'ish. It's been 4 days. He won't eat, anything! He drinks water but not often enough, usually turning his head away from the dish. We've tried all his favorite foods, nothing. Tomorrow will be 5 days. Is my dog dying? Any VET'S out there?? Any dog lovers out there?? Anyone gone through what I'm going through now?? Please write back with advice, I don't want him to die yet, anything may help. Thanks folks, Steve in Toronto.