A. Sick older pets worry me. There are so many disease processes that could be causing symptoms of what sounds like pain and nausea. If this has been going on for a couple of days, OR if she is also lethargic and not acting herself, I highly recommend you take your pet for a complete exam and bloodwork +/- abdominal radiographs to look for potential underlying diseases here.
However if this is an acute illness and she is still happy wagging her tail and active, it could just be an upset stomach. If this is the case a bland diet of boiled chicken and rice or cottage cheese can be tried to settle things down over the next 24 hrs, but if no improvement she needs to see a vet.
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