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Puppy Predictor

Border Collie Size Calculator

How big will my Border Collie get? Predict adult weight and track your puppy's development.

Breed Overview

About the Border Collie

Affectionate, smart, and energetic

Group

Herding

Size Category

Medium

Lifespan

12-15 years

Full Maturity

15 months

Temperament Traits

AffectionateSmartEnergeticAlertTenaciousResponsive

Growth & Height Benchmarks

Expected Adult Weight

30-55lbs

Typical Male

30-55 lbs

19-22" tall

Typical Female

30-55 lbs

18-21" tall

How the Border Collie Calculator Works

1

High-Sensitivity Dynamic Modeling

We use a proprietary High-Sensitivity Dynamic Model calibrated specifically for Border Collie development. This accounts for the biological reality that growth velocity decelerates sharply as a puppy matures, ensuring pinpoint accuracy for both 8-week-old puppies and older teenagers.

2

Maturity Window Calibration

A Border Collie typically reaches its full skeletal structure around 15 months. Our algorithm applies a specific maturity multiplier that adjusts the projection as your puppy approaches this target window.

3

Standard Deviation Check

Every projection is cross-referenced against the Border Collie breed standard (30–55 lbs). While estimates can begin at 6 weeks, data collected after the 12-week mark provides the highest statistical confidence.

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