Russell Terrier Puppy Weight Calculator

Calculate the adult weight for your Russell Terrier. Just type your puppy’s current weight and age, and see how big your puppy gets.

Growth-focused profile for the Russell Terrier

Breed Overview

The Russell Terrier, also known as the Jack Russell Terrier in some countries, originated in England in the early 19th century. Developed by Reverend John Russell for fox hunting, this breed is known for its agility, intelligence, and boundless energy. Compact yet strong, the Russell Terrier is quick, curious, and always ready for an adventure. With a lively personality and strong prey drive, they thrive in active households where they receive mental and physical stimulation.

This is a small breed, usually reaching between 10 and 15 inches at the shoulder and weighing around 9–15 lbs as an adult. Growth tracking matters for Russell Terriers because, despite their small stature, they are prone to becoming overweight if overfed, which can put unnecessary strain on their joints and spine. Monitoring weight also ensures they are growing steadily without being undernourished.
For more breed details, see the American Kennel Club Russell Terrier profile.

Russell Terrier Growth Chart & Weight Ranges

Below is a general guideline for Russell Terrier puppy weight. Males are usually 1–3 lbs heavier than females at maturity, but the difference is less pronounced than in larger breeds.

Age	Average Female Weight	Average Male Weight
4 weeks	1.0–1.5 lbs	1.2–1.8 lbs
8 weeks	2.5–3.5 lbs	3.0–4.0 lbs
3 months	4.0–6.0 lbs	4.5–6.5 lbs
4 months	5.0–7.5 lbs	5.5–8.0 lbs
6 months	6.5–9.0 lbs	7.0–10.0 lbs
9 months	7.5–10.0 lbs	8.5–11.5 lbs
1 year	9.0–12.0 lbs	10.0–14.0 lbs

How Much Bigger Will My Russell Terrier Puppy Get?

Russell Terriers grow quickly in the first few months, reaching about 50% of their adult weight by 3 months and 75% by 6 months. By 10–12 months, most have reached their adult size, though they may continue to fill out slightly in muscle tone for a few more months.

Rule of thumb: Double your Russell Terrier’s weight at 16 weeks to estimate adult size.

Example: A 6 lb puppy at 16 weeks will likely reach around 12 lbs as an adult.

Because they are a small breed, they mature faster than larger dogs, and most growth is complete within the first year. For more on breed information, visit the Russell Terrier Club of America.

Russell Terrier Growth Tips

Nutrition

Feed a high-quality small-breed puppy formula to meet their high energy needs without overfeeding. Divide daily food into 3–4 meals until about 6 months old, then switch to 2 meals per day. Avoid excessive treats, as small breeds gain weight easily.

Exercise

Russell Terrier puppies are energetic but still have developing joints. Provide short bursts of active play, gentle walks, and mental games rather than long, high-impact activities. As they mature, they can enjoy more vigorous activities like agility training or hiking.

Health Watch

While generally healthy, Russell Terriers can be prone to patellar luxation, Legg-Calvé-Perthes disease, and dental issues due to their small mouths. Keeping them at a healthy weight and providing regular dental care can help prevent future problems.