Track your pet weight over time with growth charts and ideal weight range indicators.
This tool is a weigh-in logbook with a chart attached. Each entry is a date and a weight; enough entries build a growth curve, with the latest weight, the change since the previous entry, and the overall trend computed for you. A reference band on the chart shows where the pet's weight should sit for its age and expected adult size, and entries outside it stand out. What surprises most people: a single weighing is nearly useless. Weights fluctuate with meals, hydration, and scale differences, so the tool earns its keep over weeks, not on day one.
A concrete input and expected output from the current implementation.
Input
Log: Week 8 - 3.0 kg; Week 12 - 4.8 kg; Week 16 - 6.0 kg
Expected output
Latest weight 6.0 kg. Gain since the previous entry (week 12): +1.2 kg. Total gain since the first entry (week 8): +3.0 kg, an average of 0.375 kg per week. The curve shows weekly gain slowing from 0.45 kg/week (weeks 8-12) to 0.30 kg/week (weeks 12-16), the deceleration typical of a puppy nearing its growth plateau.
Every stated figure is simple arithmetic on the entered weights: the 0.45 and 0.30 kg/week rates come from dividing each 4-week gain by 4, and the overall 0.375 kg/week from dividing 3.0 kg by 8 weeks. The deceleration is the pattern the chart is designed to surface, since growth naturally slows as an animal approaches adult size.
Each weigh-in is stored as a date and a weight. From two or more entries the tool plots a growth curve over time and derives three numbers: the latest weight, the difference from the previous entry, and the overall change since the first entry. Entries are handled individually, so an irregular gap (a missed week, a skipped month) does not break the series.
The chart carries a reference band representing the expected weight for the pet's age and adult size. The current weight is shown as within, above, or below that band, and entries that drift outside it stand out visually. The band is a screening aid built from population averages or a target you set yourself, not a veterinary judgment about your specific animal.
Weekly for puppies and kittens, whose weight can climb quickly and where a stall matters most. For adult pets, every two to four weeks is enough to reveal a real trend unless a weight program calls for tighter monitoring. Consistency matters more than frequency: always the same scale, at a similar time relative to meals.
Not on one reading. Ranges are averages, and healthy pups vary widely around them; the curve's direction matters more than its position. The signals worth a vet call are a curve that flattens or falls while the puppy eats normally, and any weight loss in a growing animal at all.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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