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Puppy Predictor

Jack Russell Terrier Size Calculator

How big will my Jack Russell Terrier get? Predict adult weight and track your puppy's development.

Breed Overview

About the Jack Russell Terrier

Alert, inquisitive, and lively

Group

Terrier

Size Category

Small

Lifespan

13-16 years

Full Maturity

12 months

Temperament Traits

StubbornEnergeticFearlessIntelligentAthleticVocal

Growth & Height Benchmarks

Expected Adult Weight

13-17lbs

Typical Male

13-17 lbs

10-15" tall

Typical Female

13-17 lbs

10-15" tall

How the Jack Russell Terrier Calculator Works

1

High-Sensitivity Dynamic Modeling

We use a proprietary High-Sensitivity Dynamic Model calibrated specifically for Jack Russell Terrier 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 Jack Russell Terrier typically reaches its full skeletal structure around 12 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 Jack Russell Terrier breed standard (13–17 lbs). While estimates can begin at 6 weeks, data collected after the 12-week mark provides the highest statistical confidence.

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