Feeding a Cat Well, Day After Day

An obligate carnivore is a narrower animal than a dog

A cat is not a small dog with a worse temperament. It is an obligate carnivore, which means several nutrients it cannot survive without are only reliably available from animal tissue.

Taurine is the clearest case. Cats cannot make enough of it themselves, a shortage damages the heart and the retina, and cooking destroys a good deal of what is present in meat.

Arachidonic acid and preformed vitamin A are the same story. A dog can convert plant precursors into both; a cat largely cannot.

A diet that works for a dog can slowly blind a cat, which is why the two are not interchangeable.

This is also why a complete commercial food is a reasonable default rather than a compromise. The formulation exists precisely because the margin for improvisation is narrow.

How much, and why the bag is only a starting point

Feeding guides on packaging are averages, and they generally assume a cat more active than most pets are. Guides running twenty or thirty percent above what a given cat needs are common rather than unusual.

The number on the bag is a place to start, not an answer. What corrects it is the cat.

1. Start at the label figure for the cat's ideal weight, not its current weight.
2. Weigh the food rather than using a scoop, because scoop volumes vary a great deal.
3. Reassess body condition regularly by feel as well as by eye, and record weight often enough to see a trend. A growing kitten, a weight-loss plan and a stable adult need different review intervals.
4. Adjust in small steps, around five to ten percent, and hold each change for a fortnight.

Body condition is felt with the hands. You should be able to feel ribs under a thin layer of covering without pressing, and see a waist from above.

Body condition beats the feeding guide every time, because the guide has never met your cat.

The portion size guide sets out how to convert a label figure into grams and how to adjust without starving a cat that is genuinely hungry.

Meals, grazing, and why timing matters more with age

A cat left with a full bowl will often eat little and often, which suits its physiology. That works while the cat is young, active, and holding a steady weight.

It stops working when a cat is overweight, when there is more than one cat, or when a medical condition needs portions counted.

Measured meals solve three problems at once. You can see how much each cat has eaten, you notice a lost appetite on the day it happens, and portion control stops being guesswork.

For a household that grazes, weighing the day's ration into a tub in the morning and topping the bowl from it gives you the same information without changing the cat's routine.

You cannot notice a cat has stopped eating if you have never known how much it eats.

Puzzle feeders are worth mentioning here. Making a cat work for part of its food slows eating, adds activity, and does more for a bored indoor cat than most toys.

Life stage changes the target, not the principles

Kittens need more calories per kilogram than adults and need them in a food formulated for growth. Switching to adult food is judged by whether the cat has stopped growing, not by its first birthday.

Adults need enough to hold a steady body condition, which for most neutered indoor cats is less than the bag suggests.

Older cats are the group where assumptions do the most damage. Weight loss in a cat over ten is not normal ageing. It is the single most common early sign of hyperthyroidism, diabetes, and kidney disease.

An older cat losing weight while eating well needs a blood test, not a bigger portion.

The daily calories guide sets out the arithmetic if you want a number rather than a rule of thumb.