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Parson Russell Terrier Growth Chart
The Parson Russell Terrier is the taller, longer-legged fox-hunting terrier developed by the Reverend John Russell in 19th-century England — distinct from the shorter Jack Russell Terrier. Bold, athletic, and tireless, Parson Russells are built to run all day. Most reach an adult weight of 13-17 lb between 10 and 12 months.
View weight chart (lb & kg)Calculate Your Parson Russell Terrier Puppy's Adult Weight
Enter your Parson Russell Terrier puppy's age and current weight for an estimated adult weight range.
Parson Russell Terrier weight by age
Typical male and female puppy weight ranges by age, available in lb and kg. Individual puppies may vary.
Most Parson Russell Terrier puppies approach adult weight around 11 months, although individuals may finish earlier or later.
These estimated ranges combine the breed's adult weights with a size-based growth curve. They are not measured breed-specific percentiles or health targets. Month labels are rounded approximations; use the week values for each row. How these weight ranges are calculated
Parson Russell Terrier Growth Stages
Understanding the typical growth stages helps you know what to expect as your Parson Russell Terrier puppy grows.
Neonatal
0–2 weeksPuppies are born with eyes and ears closed, relying entirely on their mother. Rapid weight gain occurs during this period.
Socialization
3–12 weeksEyes and ears open. Puppies begin to explore, play, and learn social behaviors. This is a critical period for development.
Juvenile
3–6 monthsRapid growth continues. Puppies become more independent, start teething, and develop coordination.
Adolescent
6–10 monthsGrowth rate begins to slow. Puppies reach sexual maturity and may test boundaries. Muscle mass develops.
Young Adult
10–12 monthsGrowth is nearly complete. Your puppy is filling out and approaching adult proportions.
Adult
12+ monthsYour puppy has reached their full adult size. Weight should remain relatively stable with proper nutrition.
Parson Russell Terrier FAQ
How much will my Parson Russell Terrier puppy weigh as an adult?
Adult Parson Russell Terriers typically weigh between 13 and 17 lb. The breed standard does not split this range by sex, so males and females share the same 13-17 lb band.
At what age is a Parson Russell Terrier fully grown?
Most reach adult weight between 10 and 12 months. These are high-energy dogs that can look slim through adolescence while burning off everything they eat — a lean, leggy youngster is usually right on schedule.
How accurate is a Parson Russell Terrier puppy weight chart?
It is a good guide, but this athletic little breed varies with activity level. A very active Parson Russell may run a pound or two lighter than a quieter one of the same frame. Track the trend over weeks rather than fixating on a single weigh-in.
How much should a Parson Russell Terrier puppy weigh at 12 weeks?
Check the 12-week row in the weight-by-age table above for the estimated range. If your puppy falls well outside that band, re-check the scale, the lb/kg setting, and the age entry first — a single off reading is more common than a truly unusual puppy.
Do male and female Parson Russell Terriers grow differently?
The official adult range is the same for both sexes at 13-17 lb, and the difference is small. One growth chart serves both well.