I'm glad that everything went well at the vets. Wow! Rocky sure is a big boy. I thought my Cirrus was big but he's only 13lbs but I think he's still growing cause he's only 10 months old. I feed all 3 of my cats Nutro Complete Care Weight Management Formula. They really seem to like it too. If you decide to feed your cats this brand then you'd want to use the regular adult formula. Good luck. There are many good brands of food out there.