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PARTLY

As of 13 August 2026, AI can only partly calculate the right food portion for your pet.

Most people should hand this to a purpose-built tool.

Can you do it?

5 minutesto a draft.

30 minutesto something you’d act on.

Cost, all in£0

Skill neededchat-fluent

Who has to check ityou

What the alternative costsA vet can assess your pet's body condition, health and feeding needs, but no price is provided here.

If this goes wrong, your pet may gain or lose weight or receive an unsuitable diet before you notice the problem.

What to actually do

  1. Use a tool built for this

    The route this page recommends

  2. Do it yourself

    Second choice

    A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

    How to actually do it

    1. Weigh your pet in kilograms and note its species, breed, age, neutered status, activity level and any health conditions or medication.
    2. Open the food packaging or the manufacturer's UK product page and copy the calorie value, feeding guide, life-stage information and whether the food is complete or complementary.
    3. Describe your pet's current body condition, including whether you can feel the ribs easily and whether its weight has recently changed.
    4. Paste the prompt into ChatGPT, Claude or Gemini, replace each bracketed slot with your details, and include the exact label wording rather than a copied summary.
    5. Check the model's calorie conversion and grams-per-day calculation against the food label using a calculator, then split the daily amount across the stated meals.
    6. Use a kitchen scale for the portion and monitor your pet's weight and body condition, asking your vet to review the plan if the pet has a health issue or its weight changes.

    Prompt

    Calculate a starting daily food portion for my pet using only the information below. Show the calculation in plain language, including the food's calories per gram or per 100g, the estimated daily calories, the resulting grams per day, and the amount per meal. If the label gives a recommended range, compare your calculation with it. Do not pretend this is a veterinary diagnosis or a guaranteed correct portion. State every assumption, flag missing information, and explain which factors could make the result unsuitable. Tell me to ask a vet before changing the diet if my pet is overweight, underweight, growing, pregnant, elderly, ill, taking medication, has digestive or kidney problems, or is on a prescribed diet. Use these details: species and breed: [species and breed]; age: [age]; weight in kg: [weight]; neutered or entire: [status]; activity level: [low, moderate or high]; body condition: [description or score if known]; health conditions or medication: [details]; food name and type: [food]; calories per 100g or per gram: [label value]; manufacturer's feeding guide: [paste the relevant label text]; number of meals each day: [number].

    Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

  3. Hand it to a person

    The distant third

    A person who owns the outcome does this end to end, worth it when the failure is dear.

What it gets wrong

  • AI cannot feel your pet's body condition or independently confirm its weight and activity level.
  • AI cannot diagnose an illness that is causing weight change or decide whether a prescribed diet is safe to alter.
  • AI cannot guarantee that a food is complete, suitable for the life stage or appropriate for a particular medical condition unless you verify the label and ask a vet.
  • AI cannot replace monitoring your pet over time and adjusting the plan when its weight, appetite or health changes.

What caps this at PARTLY: judgement under ambiguity, stakes of error and context depth.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output2
Inputs1
Verification1
Liability1
Effort delta2
Total7 / 10

The methodology and its thresholds are published in full.

FAQ

Can ChatGPT calculate how much food my dog needs?
It can calculate a starting estimate from your dog's weight, activity, body condition and the food's calorie information. Check the arithmetic against the label, and ask a vet before using the estimate for a puppy, an overweight dog or a dog with a health condition.
How do I calculate the right portion of pet food?
You need your pet's weight and the food's calorie content, then convert the estimated daily calories into grams or tins and divide that across meals. The food label is a starting point, not proof that the portion suits your pet, so monitor weight and body condition.
Can AI tell me if my cat is overweight?
AI can explain general body-condition guidance from a description or photograph, but it cannot examine your cat reliably or diagnose the cause of weight change. A vet should assess an overweight, underweight or suddenly changing cat.
Is it safe to use AI to plan my pet's diet?
It is reasonable for label arithmetic and a list of questions to ask your vet, but it is not a substitute for veterinary advice. Do not use it to change a prescribed diet or manage a pet with illness, medication, pregnancy or unexplained weight change.

Nearby answers

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Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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