CBC / chemistry blood tests, urine analysis, X-rays, and an ultrasound can help sort out the various possible causes of clinical signs and document the spread of cancer. (1800petmeds.com)
There are various possible causes for the symptoms you are seeing and for the high potassium and low sodium found by your Veterinarian; none of the symptoms themselves are diagnostic of one particular issue and without examining Molly I can not recommend any course of (prescription) therapy. (wagwalking.com)