Weigh your guinea pig every week because weight loss is frequently the first — sometimes the only — sign that something is wrong, appearing days or weeks before appetite changes, behaviour shifts, or anything you can see. Guinea pigs are prey animals wired to hide weakness, so problems go underground; a written weekly log turns that hidden drift into visible evidence and gives you a prompt to book a vet check while an issue is still small.
What the Scale Catches Early
A pig who is quietly eating less because its back teeth are uncomfortable, who is fighting a low-grade illness, or who is stressed by a change at home will usually lose grams before it loses enthusiasm. By the time a guinea pig looks ill, it has often been ill for a while. Weekly weights compress that delay. As a working rule, a loss in the region of 50 grams in a week, or a steady slide totalling around 100 grams, is a sensible trigger to call your vet and describe the trend — your own vet can tell you what threshold they want for your particular pig, especially for youngsters who should still be gaining and seniors who run lighter.
Feeling the body backs up the numbers: a pig who feels bonier around the hips and spine than last month is telling you the same story with your hands.
A Weigh-In Routine a Guinea Pig Will Accept
Use a kitchen scale, a small box or bowl the pig fits in, and the tare button. Same day, same time — before the morning vegetables gives comparable readings. Most pigs sit quite happily in a snug container for the ten seconds required, especially if a favourite herb appears immediately afterwards. Weigh any companion pigs in the same session; doing the whole herd at once takes minutes and means one pig's loss is never masked by comparing it to memory while the other pig gets weighed properly.
Write the number down on the spot. A log with gaps is nearly useless, because the whole value of the exercise is the unbroken line of weeks.
Making Sense of the Line
Expect small wobbles. A pig weighed after a big drink or a cucumber-heavy day reads differently from one weighed before breakfast, which is why consistency of timing matters more than decimal places. Look at three-to-four-week direction: flat is reassuring for an adult, rising is right for a youngster, and a persistent downward slope — even a gentle one — deserves a vet conversation. After any illness, surgery, or diet change, weigh twice a week until the line stabilises; recovery you can graph is recovery you can trust.
Bring the log to appointments. Vets think in trends, and owners who arrive with six months of weekly weights get sharper assessments than owners working from "he seems smaller."
Keeping the Record Where the Vet Can See It
Paper notebooks get left at home on exactly the wrong day. Keeping those weights in KinsLe's Pet Passport — the records packet that holds vaccines, medications, allergies, and documents — means the trend is ready to share with your vet at the appointment, and with an emergency clinic that has never met your pig. One habit, kept in one place, doing quiet work for years. In the exam room, your veterinarian can read the dated weekly weight entries in the Pet Passport on KinsLe — each one taken on a scale — and judge whether the line points down, holds steady, or climbs.