A. Causes of a distended abdomen include fluid collection (either secondary to heart or liver disease, or from a bleeding tumor in the abdomen), a mass in the abdomen (typically involved with the liver or spleen, but also sometimes the intestines) and enlarged organs (again, typically the liver). It's crucial to determine what's causing the abdominal distention in order to figure out how to treat it. Your dog needs to see a vet so that diagnostics such as x-rays or possibly ultrasound can be performed in order to determine what's going on.
A. Its tough when dogs age. This sounds like one of several things could be happening and I would recommend a vet appointment should be a top priority here. It could be so many things; worm infestation, sore tooth, tummy troubles or a much more serious illness. Please take her for a check up. You'll feel better knowing the true cause of the problem. I hope she is doing better soon.
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