The strictness is about arithmetic, not appearances. An outdoor cat spends part of the day moving with purpose: patrolling a territory, climbing, watching, stalking and occasionally sprinting, all of it burning energy that never shows up as a line in a feeding guide. His indoor counterpart may cross a few rooms, jump to a windowsill and sleep through the warmest hours, while eating meals of exactly the same size. Appetite does not adjust itself to match the quieter day. When intake stays set for a busier life than the one he leads, the surplus has nowhere to go except into stored weight, added in small amounts week after week. Vets press the point for indoor cats because the gap between eating and moving is widest there, and because the owner controls both sides of it completely.
The Indoor Energy Balance
Movement indoors is mostly optional for a cat, and optional movement shrinks when nothing prompts it. A bowl filled twice a day, treats given by hand and a comfortable home with no weather, no rivals and no need to travel for food remove every natural brake on intake. Neutering, age and a settled temperament can lower his daily energy use further, while the portion in the bowl often stays the size it was when he was younger and busier. The result is a slow gain that clothing cannot hide on a cat but familiarity can: you see him daily, so a gradual change in shape registers as normal. Feeling for his ribs and looking for a waist from above and a tuck from the side gives a rougher check between weigh-ins, yet the scale remains the honest measure, because shape by eye is exactly where slow gain hides from the person who loves him.
Boredom Feeding and the Creeping Bowl
Indoor cats often learn that the kitchen is where interaction happens. He appears, he calls, a person responds, and food is the response humans reach for without thinking, so asking and eating become the same conversation. Grazing from a bowl left down all day removes even the pause between meals, and in a multi-person home several people may feed him without realising the others already have. Treats, dental chews and scraps from plates rarely feel like meals, yet they count in his day all the same. Breaking the pattern starts with noticing it: play before the evening meal, measured portions rather than a topped-up bowl, and one agreed feeding routine for the whole household. The point is not to make his life smaller. Food is one pleasure among several, and a cat who plays, climbs, scratches and watches the street from a perch has a fuller day than a cat whose only event is the next refill.
Weigh-Ins and the Vet-Set Goal
The goal itself belongs to the vet, who sets his goal weight and daily amount from his frame, age and health picture, rather than from a chart on a food bag. This article names no calorie figure, because the right amount for him depends on that examination and on the food actually being fed. A weight log that makes reviews useful holds exactly four fields, date, weight, daily amount, notes, and a real entry might read: date, 6 May; weight, 5.4 kg on the clinic scale; daily amount, the vet-set amount from his plan card, split over two meals; notes, evening play session added before the second meal. Monthly entries in that shape show whether the plan is holding or drifting, long before shape alone would tell you. If his weight climbs despite the agreed amount, or falls faster than the vet expects, that log is the evidence to take back rather than adjusting portions by guesswork at home. Keeping that log in your Pet Passport means his weigh-ins and the vet-set amount sit beside his visit history inside KinsLe at every review.