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Cat Weight Loss Tracker

When a cat is slowly getting lighter even though it is still eating, the question that matters is "how much has it actually lost, and how fast?" PetHealthLog lets you log your cat's weight over time, note appetite and energy, and watch the trend and the percentage change - so a slow decline that is easy to miss day to day becomes something you can see and act on. Free, no account, works offline.

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A still-eating cat that keeps getting lighter is the question

It is easy to assume a cat that is eating well is fine. But veterinary sources are clear that weight loss in a cat that is still eating is rarely normal, and it is often the first hint of something underneath. When a cat keeps eating - or even eats more - yet keeps getting lighter, hyperthyroidism is one of the most common causes in older cats, and diabetes, kidney disease and intestinal problems are on the list too.

The trouble is that cats are masters at hiding illness, and a slow loss is genuinely hard to see. A few ounces vanish over weeks, the fur hides the change, and by the time the ribs feel sharper you are guessing how long it has been going on. "She looks a bit thin lately" is hard to act on, and it is exactly the kind of change a regular weigh-in catches early.

PetHealthLog is free, asks for no account and works offline, so each weigh-in gets logged with the date. The trend and the percentage change are right there, the slow decline is visible instead of hidden, and you have a real record instead of a guess when you call.

What the weight loss tracker actually does

A weight log only helps if it is quick to record and turns scattered numbers into a trend you can read. Here is how PetHealthLog handles both.

Signs that mean call the vet, don't wait it out

General guidance from veterinary sources - when in doubt, call. The tracker helps you spot these, it does not decide them.

  • Losing more than about five percent of body weight, especially within a month
  • Steady weight loss even though your cat is still eating normally or more
  • Weight loss alongside much more drinking or urinating, or vomiting and diarrhea
  • A poor or greasy coat, low energy, or hiding more than usual
  • A senior cat (over eight to ten years) getting lighter without an obvious reason
  • Any fast or dramatic drop from your cat's usual weight

Everyday extras while you and your vet sort it out

While you keep a record and your vet looks into the cause, owners often find a couple of everyday items handy: an accurate digital pet or kitchen scale to weigh a small cat reliably, and high-calorie or appetite-friendly food that a vet has suggested to help hold weight. None of these treat the reason a cat is losing weight - they just make weighing easier and support everyday comfort while the vet handles the cause.

These search links show popular options on Amazon. They are everyday weighing and feeding extras - why your cat is losing weight is a question for your vet.

Digital pet scales → High-calorie cat food → Appetite-support gels →

#ad - affiliate links: as an Amazon Associate, PetHealthLog may earn from qualifying purchases at no extra cost to you. Informational only, not veterinary advice.

Why "free, offline, no account" matters here

Weight loss does not happen all at once. It creeps in over weeks, hidden under fur and easy to talk yourself out of. The last thing that should stand between you and recording a weigh-in is a login screen or a spinning loader.

PetHealthLog stores everything locally on your device. There is no account to create, nothing is uploaded to a server, and there is no tracking. It opens instantly, lets you log a weigh-in or check the trend whether or not you are online, and keeps the data yours. You can export a backup any time and restore it on another phone.

Get started in under a minute

  1. Open the app - no download from a store and no sign-up required.
  2. Add your cat, then log today's weight and how the appetite and energy have been.
  3. Weigh in regularly, add a note on what changed, and watch the trend and percentage build.
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Frequently asked questions

Is this cat weight loss tracker really free?
Yes. Logging your cat's weight over time, seeing the trend and the percentage change, noting appetite, vomiting and energy, and the PDF report are all free to use. There is no sign-up and no account, and your cat's records stay on your own device.
Why is my cat losing weight but still eating normally?
Veterinary sources are clear that weight loss in a cat that is still eating is rarely normal and usually points to an underlying problem. When a cat keeps eating - or even eats more - yet keeps losing weight, hyperthyroidism is one of the most common causes, especially in cats over eight to ten years old, and diabetes, kidney disease, intestinal disease and other conditions are also on the list. Cats are very good at hiding illness, so a slow decline can be underway for weeks before it is obvious. Tracking the actual weight over time, rather than relying on how your cat looks day to day, is what helps catch this early and gives a vet a clear picture.
When should I take a cat that is losing weight to the vet?
General guidance from veterinary sources is that losing more than around five percent of body weight, especially within a month, is significant and warrants a vet visit - and that weight loss in a cat that is still eating is itself a reason to be seen, even if the cat seems otherwise fine. Sooner is better if the loss is fast, or comes with vomiting, diarrhea, much more drinking or urinating, a poor coat, or low energy. Bloodwork can often catch the cause early. The tracker helps you see how much has been lost and how quickly, but whether and when your cat needs to be seen is always a decision for your vet.
How do I know if my cat's weight loss is significant?
Because cats are small, even a few ounces can represent a meaningful share of their body weight, which is why one casual glance is easy to misread. Veterinary sources commonly treat a loss of more than about five percent of body weight as significant, and more than that over a single month as a reason for prompt care. A simple record of the actual numbers over time turns a vague "she looks a bit thin" into a clear percentage and trend you and your vet can read. The tracker does not decide what counts as too much or interpret the numbers; it just keeps an accurate record so the change is visible.
What else should I log alongside my cat's weight?
Weight rarely tells the whole story on its own. You can note whether your cat's appetite is up, down or unchanged, any vomiting or diarrhea, changes in drinking or urination, energy and grooming, and any diet change or medication. Those details are exactly what helps a vet narrow down whether the loss points toward something like hyperthyroidism, diabetes or kidney disease, and they are easy to forget by the time you are at the clinic with a worried cat in a carrier.
Does it work without an internet connection?
Yes. PetHealthLog is a progressive web app that works offline. Once it has loaded you can record a weigh-in, add a note about appetite or energy, or check the trend without a connection, so logging the number after a kitchen-scale weigh-in never depends on having a signal.
Is this a substitute for veterinary advice?
No. PetHealthLog is a record-keeping tool, not veterinary advice. It does not diagnose why a cat is losing weight, decide whether it is hyperthyroidism, diabetes or kidney disease, or tell you it is safe to wait. Whether your cat needs to be seen, and how soon, is a decision for a licensed veterinarian - the tracker simply helps you keep an accurate record of the weight over time and what else is going on.

Catch a slow decline before it hides for weeks

Free, offline, and ready the moment you open it.

Start with PetHealthLog
Informational only - not veterinary advice. PetHealthLog helps you keep records and stay organised, but it does not diagnose why a cat is losing weight, decide whether it is hyperthyroidism, diabetes or kidney disease, or tell you it is safe to wait. Weight loss in a cat that is still eating is a recognised reason to be seen. If your cat keeps getting lighter, loses more than about five percent of its weight, or you are simply worried - contact a licensed veterinarian.

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