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A PetsLately iPhone app is planned.

iOS development has not started. The website works fully without an app.

About the app

A clearer view of change over time

Cat Weight Tracker

Record weigh-ins and see the mathematical trend in plain numbers. No “normal / abnormal” zones, no cat BMI — just the change, so you can talk it through with your vet.

  • Runs locally
  • No normal/abnormal zones
  • kg or lb
  • Not medically reviewed

Not medically reviewed

No veterinarian has reviewed or endorsed this tool. It only shows arithmetic change between measurements; it does not decide whether a weight or trend is healthy, normal or urgent.

PetsLately is a consumer record-keeping and educational tool, not a veterinary clinic, hospital, telemedicine, diagnostic, or emergency service. It does not provide veterinary medical advice, diagnosis, prognosis, treatment, prescriptions, or medication dosing. Using PetsLately does not create a veterinarian-client-patient relationship. Contact a licensed veterinarian for medical advice. If your cat may be in immediate danger, contact a veterinarian or emergency veterinary service now.

Restoring your draft…

Keep the records going — optional

The optional .catcare download is a provisional plain-text export for possible future PetsLately compatibility. No app can import it today; use the PDF, CSV, printout, or copied text now.

What is a .catcare file?

A .catcare file holds the health details you entered here — in plain text. It is a provisional export for possible future compatibility with a PetsLately app.

  • Stays on your device — nothing is uploaded.
  • Optional — every tool works fully without it.
  • No app can import it today; iOS development has not started.

It is not a backup. Keep a PDF, CSV, printout, or copied text as your usable record.

A PetsLately iPhone app is planned; iOS development has not started. Read the app plan

How to use this tracker

  1. Weigh your cat — the same scale at a similar time of day keeps readings comparable.
  2. Add the weigh-in — date, weight in kg or lb, and an optional method and note. Switching units never clears what you typed.
  3. Read the change, not a verdict — with two or more entries you get the baseline, latest, absolute and percentage change, ready to print, copy, or download for your vet.

Rules and limits

Math rules (version 1.0.0, effective 2026-07-17): lb → kg = lb × 0.45359237 · absolute change = latest kg − baseline kg · percentage change = change ÷ baseline kg × 100. Values are shown with 1 decimal in kg or lb.
  • Shows mathematical change only (absolute and percentage); it is not a medical judgment.
  • No "normal/abnormal" zones, no ideal-weight claim, and no cat BMI.
  • At least two valid measurements are required before any change is shown.
  • A change in scale or unit can add noise; the tool flags it, it never turns it into a medical alert.

Sources and review

Tool version: weight-tracker v1.0.0 (rules effective 2026-07-17) · Method: arithmetic trend only

Review status: Not medically reviewed · owner-approved 2026-07-31

Average cat weight: adult weight chart and context — why a single number can’t tell you if your cat is healthy, and how trends give better context than any chart row.