I gave one of my cats (from 8 thru 10 years old.) a shot a day of insulin for 2 years. Have to kind of guess at dosage, unfortunately.
If the blood sugar can be stabilized, she can be ok. Still, not a good prognosis
(cat didn’t like that needle, for sure)
I gave a good ol’ cat with kidney failure subcutaneous saline for about a year. He was a good cat, and was worth the trouble. He didn’t much like the needle, either.
MY cat, Ben actually developed a pavlovian reaction to the needle because he knew that after each shot, he got a yummy treat. He adored the canned food the vet prescribed.
If you give the shot correctly, the cat never even knows it’s been given. Scruff the kitty, and give the shot at the back of the neck, the part where the mother cat grabs onto her kitten to carry it about. My vet taught us how to do this, and we gave our little diabetic kitty her insulin twice a day. She liked it, because to her, it just meant she got petted twice a day—she never felt the needle.