Do you have a scale you can weigh him on? I would just compare what hes getting with what the packaging recommends. He'll adjust. Or just cut back really really slowly. I have a baby scale I bought when my girls had some health issues and dropped weight quickly. I don't know that I'd invest in one unless you really need to. But you can always weigh yourself holding him and not for some idea. My vet always said to go slow with weight loss.How do I tell if Felix is really starving or if he's just begging for food out of habit? I cut back a bit because he was getting quite large but he's acting like he's hungry all the time now.