How often should I weigh my dog or cat?

For a healthy adult pet, once or twice a month is a good rhythm — enough to see a trend without obsessing. Puppies and kittens grow fast and can be weighed weekly. If your vet is monitoring a condition, follow their schedule instead.

How can I weigh a cat or small dog at home?

Use the two-step bathroom-scale method: weigh yourself holding your pet, then weigh yourself alone, and subtract. It's accurate enough for trend tracking if you always use the same scale. For pets under about 2kg, a baby scale gives better resolution.

How much weight change is a problem for a pet?

A common rule of thumb many vets use: an unplanned change of around 10% of body weight deserves a conversation with your vet — for a 4kg cat that's just 400g. Steady drift across several weigh-ins matters more than any single reading, which is why a written log beats memory.

What should a pet weight log include?

Date, weight, the scale you used, and one short note about context (new food, more exercise, seemed off). Four columns is enough. The habit of writing it down — always the same way — is worth more than any fancy format.

Gotcha Day: How (and Why) Pet Parents Celebrate Adoption Anniversaries — Plus a Weight-Tracking Primer for Vet Visits

Somewhere in your phone there is a photo from the day your pet came home: the too-big carrier, the uncertain first sniff of the hallway, the name you weren't sure about yet. That day has a name — gotcha day — and celebrating it is one of the loveliest habits in modern pet parenthood.

This article covers both halves of a good gotcha day: the celebration, and a quietly practical gift that costs nothing — starting a weight log your vet will actually use.

What is a Gotcha Day?

A gotcha day is the anniversary of the day your pet joined your family. For adopted and rescued animals with unknown birthdays, it's the anniversary; for everyone else it lives happily alongside the birthday, and often outranks it. A birthday celebrates their existence — a gotcha day celebrates your life together, and it's the one date you always know precisely.

Counting from that day changes how the whole archive feels. "Family for 847 days" tells a story that a folder of files never will. (This idea is built into Memofu's pet timeline, which counts every day from gotcha day forward.)

Why bother celebrating a pet anniversary?

Because anniversaries are when memories actually get revisited — and revisiting is the part we all skip. A 2026 survey of 8,000 smartphone users found that around 70% of photos are never looked at again after they're taken; roughly half of people feel stress about the state of their camera roll. The photos exist. The remembering doesn't happen on its own.

An anniversary is a scheduled reason to remember: flip through year one, watch the shaky first-week videos, laugh at how small they were. Rituals do for memory what habits do for health — they make the good thing happen by default.

Five easy gotcha day rituals

No party supplies required:

The same-spot photo. Recreate that first-day photo in the same doorway or corner, every year. By year five, this series will be your favorite possession.
The annual letter. Three sentences about who your pet was this year. ("This was the year you discovered the heating vent.")
The feast. A pet-safe upgrade dinner — a bit of plain cooked chicken beats a decorative cake they can't eat.
The rewatch. Ten minutes, together as a family, watching last year's videos. This is the whole point of having taken them.
The health check-in. Which brings us to part two.

Why a weight log is the best gotcha day gift

Here's the unglamorous truth every pet parent eventually learns at a vet visit: the question is always "when did this start?" — and memory is always vague.

Weight is the single most information-dense number you can track at home. It's objective, it's free to measure, and gradual weight change is an early signal for a long list of conditions in dogs and cats — from thyroid and kidney issues to dental pain that makes eating unpleasant. Vets weigh your pet at every single visit for a reason.

The catch: a weight is only useful as a trend. One reading means almost nothing; twelve readings across a year mean a lot. That's why the habit matters more than the tool.

How to weigh your pet at home

Cats and small dogs — the two-step method:

Step on the bathroom scale holding your pet. Note the number.
Step on it alone. Subtract.

Always use the same scale, at roughly the same time of day (before breakfast is the classic). Bathroom scales aren't laboratory instruments, but consistency makes the trend trustworthy even if the absolute number is a little off.

Very small pets (under ~2kg): a baby scale or kitchen scale with a bowl gives you the resolution a bathroom scale can't.

Big dogs: many vet clinics are happy for you to walk in and use the lobby scale between visits — ask once, then make it part of the monthly walk.

Reading the numbers: when to call the vet

The 10% rule of thumb. An unplanned change of around 10% of body weight is worth a conversation with your vet. Scale that to your pet: for a 4kg cat, that's 400g — an amount you would never notice by eye under the fluff.
Direction and speed beat any single number. Three readings drifting the same way matter more than one odd reading. Re-weigh a strange result the next morning before worrying.
Write context down. Switched food, started more walks, hot summer week — the note next to the number is what turns data into an answer at the clinic.

A printable weight log

Four columns is genuinely all you need. Print this, stick it on the fridge or inside a cupboard door, and fill in a line or two per month:

Date	Weight	Scale used	Notes

Rules of the fridge sheet: same scale, same time of day, one honest note. That's it.

When paper stops being enough — when you want the chart, reminders, and the log living next to the photos and vet notes — that's what Memofu's health log is for. It stores weights in consistent units, draws the trend, and exports a clean history you can hand to your vet (free plan included; export is free forever, like everything else that matters).

Start on gotcha day

Anniversaries work because they're scheduled. So schedule both halves: this gotcha day, take the same-spot photo, rewatch the old videos — and write down a weight. Next year, you'll have the sweetest photo series in your camera roll and twelve data points your vet will genuinely thank you for.

That's the whole trick of pet parenthood, really: the love is automatic, and the memory and the health both need a system. Give them one.