A free app — supporting cats and dogs
A calm way to follow your pet's weight over time — with published Waltham growth context for puppies and kittens and a clear trend for adult pets.
Orion
Cat · 2 years
Latest
4.2kg
3 days ago
12-week trend
Today
Weigh-in
08:00 · before breakfast
Breakfast
07:30
Vet check-up
In 3 weeks
The curve
For puppies and kittens, peer-reviewed Waltham growth references give age-aware context for each weigh-in. For adult pets, a consistent record shows how weight is moving over time.
Moggly turns those entries into a clear longitudinal trend, so you can keep an eye on direction of travel and share helpful context with your vet if something changes.
Drag across the chart — this is the same centile fan the app draws.
Waltham centile fan — as drawn in the app
The bold line is the population median — orientation, not a target. Reference centiles refitted from the Waltham Puppy Growth Charts research (Salt et al., 2017), medium-size female dogs. Example weigh-ins are illustrative. Reference centiles refitted from the Waltham Kitten Growth Charts research (Salt et al., 2022), female cats. Example weigh-ins are illustrative.
Ten seconds. Bathroom scales, pet scales, or hold-and-subtract — the app tells you which is most accurate for your pet's size and nudges you towards the least error-prone option.
Latest
8.4kg
3 days ago
Holding steady
Weigh-in
Optional reminders: a weekly weigh-in reminder, feeding-time prompts, and vet-visit reminders if you want them. Each is configurable — turn any of them off.
Today
Weigh-in
08:00 · before breakfast
Breakfast
07:30
Evening meal
18:00
Vet check-up
In 3 weeks
Today
The direction of travel, smoothed. Daily fluctuation (meals, hydration, full-vs-empty bladder) is stripped out so you see the real trajectory — not a jittery line that looks alarming.
12-week trend
Trend
For puppies and kittens, growth is guided by peer-reviewed Waltham research — separate puppy and kitten studies, both open-access, from the same Liverpool research team. Gentle prompts if growth looks unusually fast or slow.
Growth · medium
Growth chart
Export a clean, one-page history of weigh-ins and feeding as a PDF. Bring it to your appointment, or email it ahead. Saves your vet hunting through your camera roll for context.
For your vet
Summary PDF
Developed by scientists and grounded in published veterinary research. Where evidence is limited, we say so plainly.
Full references →No. Once a week is fine for maintenance. Daily can give slightly faster feedback if you're actively watching a trend.
Moggly is a tracking tool, not a veterinary service. It does not make clinical judgements or provide veterinary advice. If something looks worth a chat with your vet, it can help you prepare a summary to take along.
Puppies, kittens, and senior pets: yes. Puppy growth tracking is guided by the Waltham Puppy Growth Charts research (Salt et al., 2017; up to ~40 kg adult weight, across five size categories). Kittens are guided by the newer Waltham Kitten Growth Charts research (Salt et al., 2022; ~22,000 cats, same research team). Both bodies of work are peer-reviewed and open-access. Giant dog breeds above 40 kg, and pedigree cats with unusual weight ranges (Maine Coon, Ragdoll, Norwegian Forest): the app still tracks weight but tells you where reference data runs out.
Moggly is designed for users worldwide. Your data is stored securely, you can export or delete it, and we do not sell it. The Privacy Notice has the legal detail.
Moggly is free to use on iOS and Android.
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