Calculate the adult weight for your Jack Russell Terrier. Just type your puppy’s current weight and age, and see how big your puppy gets.
Weight Predictions
Predicted Adult Weight
Based on current weight and age progression
AKC Breed Standard
Official AKC weight range for this breed
Breed Average
Average weight for this breed and gender
Growth Timeline
Important Notes
- These predictions are estimates based on breed standards and growth patterns
- Individual dogs may vary significantly from these predictions
- Factors like nutrition, health, and genetics affect final adult weight
- Consult your veterinarian for personalized growth assessments
Jack Russell Terrier Breed Profile & Growth Guide
Breed Overview
The Jack Russell Terrier is a lively, energetic, and intelligent small breed that originated in England in the early 1800s. Developed by Reverend John Russell for fox hunting, this compact terrier is known for its fearless attitude, strong prey drive, and endless enthusiasm. Jack Russells are affectionate and devoted to their families, but need consistent training and plenty of stimulation to thrive.
Despite their small size, they have a big personality and excel in dog sports, agility, and obedience. Jack Russell Terriers are best suited to active households where they can burn off energy and engage in regular mental challenges.
Size Category: Small
Jack Russell Terriers fall into the small breed category, typically weighing 13–17 lbs and standing 10–15 inches tall. Due to their high energy levels and fast development as puppies, tracking growth is important to ensure they are growing at a healthy rate without becoming under- or overweight.
For more about this breed, visit the AKC Jack Russell Terrier profile.
Jack Russell Terrier Growth Chart & Weight Ranges
| Age | Male Weight (lbs) | Female Weight (lbs) |
|---|---|---|
| 4 weeks | 1.5 – 2.0 | 1.3 – 1.8 |
| 8 weeks | 3.0 – 4.0 | 2.8 – 3.8 |
| 3 months | 5.0 – 7.0 | 4.5 – 6.5 |
| 4 months | 6.5 – 9.0 | 6.0 – 8.5 |
| 6 months | 8.5 – 12.0 | 8.0 – 11.0 |
| 9 months | 11.0 – 14.0 | 10.0 – 13.0 |
| 12 months | 13.0 – 17.0 | 12.0 – 16.0 |
Note: Males typically weigh 1–2 lbs more than females. Growth rates can vary depending on activity level, diet, and genetics.
How Much Bigger Will My Jack Russell Terrier Puppy Get?
Jack Russell Terriers experience rapid growth during the first six months and usually reach full size within the first year.
- 50% of adult weight by 3–4 months
- 75% of adult weight by 5–6 months
- Full adult size by 10–12 months
Rule of thumb:
Double your Jack Russell’s weight at 16 weeks to get a rough estimate of adult weight.
Exceptions:
Some puppies from larger lines may take a bit longer to fill out, but Jack Russells rarely grow beyond 12 months of age.
For more health and training tips, consult the Jack Russell Terrier Club of America.
Jack Russell Terrier Growth Tips
Nutrition
- Feeding Schedule: Feed 3 meals per day until 6 months old, then shift to 2 meals per day.
- Use a high-quality small-breed puppy food formulated for active dogs.
- Monitor portions—Jack Russells are energetic but can gain excess weight quickly without proper balance.
Exercise
- These puppies are very active and benefit from several play sessions each day.
- Avoid overexertion in young puppies—stick to safe, age-appropriate exercise like fetch, short walks, and puzzle toys.
- Mental enrichment is vital—Jack Russells thrive on problem-solving tasks and interactive training.
Health Watch
- Patellar luxation (knee dislocation) is common in small breeds—keep your puppy at a healthy weight to reduce the risk.
- Dental care: Begin brushing early to prevent plaque buildup and tooth loss later in life.
- Leg injuries: Because they’re prone to sudden bursts of energy, supervise play to prevent rough jumps or falls that could harm growing joints.
📬 Get More Jack Russell Terrier Tips
Want monthly tips, product deals, and health checklists for your Jack Russell Terrier?
📩 Join our Free Newsletter