I'm glad you're taking great care of Tubby.I took my mom's cat when he was 16 years old because she couldn't bend to give him his kidney medicine anymore.The Orange cat "Dude" I stole him when he was about 3 years old from a family's backyard because I knew the family was abusing him.I told the family eventually and they seemed happy to be rid of him.
But I took him from my mom after living a long life with her to continue his care.His kidney failure was rapid but I kept up his meds had his rotten teeth removed and he lived a great life of 3 more years with me and Mike and KiKi and BooBoo.I cryed like a baby for 3 whole weeks aftyer his departure.We had to put him down because he had to much fluid around his heart and had an extreemely high temp.He loved it here with us though and was a very funny kitty.
Please make sure they take his Temp every visit.The last visit was with a fill in vet and she did not take his temp and told me to come back in a week.Well...a week was to late.His temp was sky rocketed by 3 days later and my vet yelled at her because he could of got extra life.Now I take their temps myself when I suspect anything wrong. 100.5 - 102 is normal for cats.Good luck with your baby Tubby.May he live another few years of good health.