I'm very sorry to hear about your dog's diagnosis. The kidneys have an important job in the body. They are responsible for getting rid of things that should no longer be in the body and keeping things in that should remain. For example, your dog needs his protein, but failing kidneys often let protein slip through. You dog needs to get rid of building urea, but may keep it in failure.
The kidneys do a great job of having the body help it compensate when failure first starts and we don't see any outward signs that there is a problem. By the time symptoms appear, 75% of kidney cells have been affected. This sounds severe, and is, but remember the body can live with just one kidney (50%), so we aim to help the kidneys the best we can at this point.
If the kidney values (creatinine, BUN) are significantly high, we often hospitalize the pet and start intense IV fluid therapy to give the kidneys a boost and help it flush out the toxins that are building. This can often be completed in 3-5 days. Once levels are lower, we usually start a low protein diet and recommend both encouraging water intake at home, as well as giving subcutaneous fluids at home, regardless the weight of the dog. This helps keep the animal hydrated and flushed, the best chances at keeping the kidneys working properly.
I am sorry to hear your vet say something rediculous like your dog is too big. It just requires giving a larger amount of fluid. I've been successful in giving a rescued 110 pound dalmation SQ fluids for chronic kidney failure daily for 3 months. A Liter was given daily. For severe increases in creatinine, though, IV fluids (dog or cat) is needed to properly flush at first, then SQ at home.
I'm sure the fluids would indeed help her feel better for some time.
Good luck, and let me know if you need further help with this.
Christine
Christine M. Peterson, Licensed Veterinary Technician (NY)
Please click ACCEPT if I have answered your question. Positive FEEDBACK/ BONUSES are greatly appreciated. I strive to help you and your pet; No info on Just Answer can give a diagnosis.