How to Portion Your Pet's Food

What this page won't tell you

How much to feed your animal. Be wary of any page that will.

The right amount depends on species, breed, age, whether the animal is neutered, how active it is, its body condition, and any medical conditions it has — and on the calorie density of the specific food, which varies enormously between products.

There are two authorities: the feeding guide printed on your bag, and your vet. The vet outranks the label, especially for a growing, pregnant, elderly, overweight or unwell animal.

What follows is the arithmetic that comes after you have their number — and that part genuinely does go wrong.

Treats are food

This is the big one, and it's invisible precisely because it happens to people who are measuring carefully.

Training treats, chews, dental sticks and the piece of cheese wrapped around a tablet all carry calories. If the measured meals stay exactly the same size and the treats go in on top, the animal is eating more than the feeding guide intended — every day.

So the tool subtracts the treat share rather than adding it:

Treat share	Food per day	Food per meal (2 meals)
0%	300 g	150 g
10%	270 g	135 g
30%	210 g	105 g

Treat allowance per day is expressed in food-equivalent grams — the amount of ordinary food whose place the treats are taking. Most treats are considerably more calorie-dense than complete food, so the actual weight of treats matching that allowance is usually smaller, sometimes much smaller. Treat packaging generally states calories; if you want precision, compare calorie for calorie rather than gram for gram.

Read it as a generous ceiling, not a target.

A scoop is a volume, not a weight

Feeding guides are written in grams. Scoops and cups measure volume. The two only line up for one particular food.

How much a scoop holds depends on the kibble's size, shape and density — so the same scoop filled with two different products holds noticeably different amounts. Switching foods while keeping the scoop is a quiet way to change the portion without deciding to.

Weigh one level scoop of the food you actually feed, once, on a kitchen scale. It takes a minute and stays correct until you change product.

This matters more the smaller the animal is. At the defaults above a meal is a little over one scoop; for a cat eating 60 g a day across three meals it's 0.4 of a scoop — at which point eyeballing a scoop is a substantial fraction of a day's intake.

Consistency is the actual point

Feeding guides are calculated for an average animal, and yours isn't average. Neutered animals in particular often need meaningfully less than the label suggests.

If your pet is gaining or losing weight when it shouldn't be, that's a conversation with your vet — not an adjustment to make from a website.

But here's what the arithmetic contributes: if the portion is the same every day, a change you and your vet make can actually be measured. A portion that drifts week to week makes it impossible to tell whether anything you tried had an effect. The weight log on the printable sheet is there for that reason — the number worth tracking is the animal, not the food.

Reorder a week early

Days a bag lasts and Reorder after about exist to prevent one specific bad evening.

Running out means an emergency trip for whatever the nearest shop happens to stock, and an abrupt change of food is a common cause of digestive upset. That's unpleasant for the animal and completely avoidable.

A week of buffer costs nothing beyond buying one bag slightly earlier than you otherwise would, and it turns "my supplier is out of stock" from a problem you have to solve tonight into a mild inconvenience.

Bags for the period is the shopping version of the same figure — how many bags cover however far ahead you're planning. It's useful for a bulk order, for working out whether a subscription interval actually matches your consumption, and for knowing how much storage you're committing to before the pallet arrives.

If you're changing food

Read the new guide rather than carrying the old number across. A different product has a different calorie density, so the daily gram figure will usually change — sometimes substantially, even for a similar-looking food.

And weigh the scoop again. It's a different kibble.