Why is my dog bloated, not eating, lethargic, and constipated?

I am very sorry to hear about Gracey. These symptoms are certainly concerning and warrant a visit to Gracey's veterinarian for an examination. We can see constipation in dogs but we don't see it commonly and it usually wouldn't cause enlargement of the abdomen unless it was severe. It is possible she isn't have bowel movements because she hasn't had any intake of food. With a bloated appearance to the stomach we worry about fluid buildup in the belly which can be a result of heart disease, low protein levels (which an be due to kidney or intestinal disease or severe parasitism), bleeding or oozing from a tumor. We can also have enlargement of the belly due to a space occupying mass (such as a tumor). If your dog isn't spayed then another possibility would be a uterine infection (her uterus could be full of pus and causing the bloated look). I would recommend having Gracey seen as soon as possible, if she seems lethargic or has an elevated temperature (over 102.5), has pale gums, or is vomiting then she should be seen tonight at the emergency vet. Some of these conditions can be life threatening if left untreated.