Welcome to PT. Sorry that it is at such a stressful time for you.
When your cat had the initial diagnosis, the K/d prescripton food is FOR LIFE, to continue her good quality of life as long as possible. You really should have continued that.
So now she is in early stage CRF - chronic renal failure. Fluids will help her, and will prolong her life and slow the progress of the disease. This is not like a cold, that she will recover from. This is permanent, and progressive.
My cat, RB Mr. Amber Cat, had this and I did the subcutaneous fluids at home. We started at once every 3 days. By the end of 8 months, he was at 3 times per day and that wasn't enough. At 4 times a day I called a halt and had him PTS. At that point in time, he wasn't enjoying life. Amber was my first cat ever, so the disease was pretty far along by the time I realized there was an issue. Up to that point, he would ALWAYS be hungry, even learning to open the cupboards to help himself to food. He was liek a warm toasty oven next to me in bed at night. All these were early warning signs, but I didn't know that.
It cost him quite a few years of his life.
Because the first problem he has was an over active thyroid. And leaving that untreated overworked his kidneys. It would have been so easy if I'd taken him in to the vet promptly at the first signs - a small pill once or twice per day to replace the hormone he wasn't getting, and all would have been well for several years.
Age 10 is young for a cat to develop kidney issues. Sometimes it is genetic. Other times, it is brought on by the food the cat lives on. Grocery store quality foods are horrible for pets, and for cats those sorts of foods overwork the kidneys daily, leading to kidney issues. I learned my lesson the hard way, and I now feed a high quality kibble with lots of added canned (also high quality) food. Cats are not used to drinking water from a bowl or stream in the wild; they rely on their prey to provide the fluids they need. So the house cat also needs to get their fluids with the meal.
High quality cat foods contain NO grains. Cats are obligate carnivores - they MUST eat "meat" to obtain the protein they require. Cat food also contains taurine, required for proper eye maintenance. Taurine occurs naturally in the liver of mice - a prime ingredient in a wild cat's diet. So again, a high quality cat food is necessary to have the nutrition a cat needs.
Getting your kitty back on the prescription food, and on the fluids, will help improve her current condition, and slow the progress of the disease. How long? There is no magic formula. The sooner the disease is caught and treatment starts, the longer the cat will live.
As Karen says, you can learn to do the fluids at home. Use a small "S" hook, and make a loop of string, and hang the IV bag from this. I used a kitchen cabinet, so I could have the cat up on the counter. It was easy this way. I left the "S" hook and string loop in place, just removing the IV bag until it was needed again.
The smaller the needle you use, the less "pinch" the cat feels - but this means a slow drip. A larger needle makes for a faster process, but the cat is definitely going to feel that! These are things you can discuss with your vet.
Good luck, and feel free to ask more questions, here AND at the vet!
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