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Hello and thanks for trusting me to help you and Murray today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
I am sorry that your boy is having these problems. Draining the fluid is an option, but unless the cause of the fluid buildup is identified and corrected if possible, it will simply return. It is hard to say how quickly and that is somewhat determined by the cause as well. I am not sure if a cause was mentioned to you, but they can include things like abdominal tumors, low protein levels due to liver, GI or kidney disease), heart disease or viral diseases like FIP. The prognosis on most of these, especially once fluid build up is occurring is not great, but drainage may provide a temporary extension of quality of life.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
I would suspect a pancreatic tumor may be visible on an ultrasound. With high blood glucose levels, an acute pancreatitis is also a possibility. It can be a challenge to confirm, but treatment is usually somewhat supportive and can include pain medication, steroids, fluid therapy as well as plasma transfusions. Draining the abdomen and/or adding a secondary diuretic like spironolactone may be helpful. These are often critical cases and must be managed in a critical care facility or Veterinary ER.