Use this Jack Russell Terrier puppy weight calculator to predict how big your puppy will get. Jack Russell Terriers are a terrier breed that typically reach full size by around 12 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
Indoor/outdoor enclosure — a good fit for toy and small breeds.
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| Age | Weight |
|---|---|
| Birth | 0.2 to 1 lbs |
| 2 Months | 2 to 5 lbs |
| 3 Months | 3 to 6 lbs |
| 4 Months | 4 to 8 lbs |
| 5 Months | 5 to 9 lbs |
| 6 Months | 6 to 11 lbs |
| 7 Months | 7 to 12 lbs |
| 9 Months | 8 to 14 lbs |
| 10 Months | 9 to 15 lbs |
| 1 Year | 9 to 15 lbs |
| 1.5 Years | 9 to 15 lbs |
| 2 Years | 9 to 15 lbs |
Estimated from typical toy-breed growth curves and the Jack Russell Terrier's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Prone to patellar luxation, lens luxation, and hereditary ataxia (a neurological condition affecting coordination); some deafness also occurs in the breed.
A quality diet in measured portions; genuinely high energy means calories should match real activity level.
The short or wiry coat needs minimal brushing.
Highly intelligent but strong-willed — consistent, engaging training and serious daily exercise are essential, or that energy turns into digging and other unwanted behaviors.
A small, energetic English terrier bred to hunt foxes by going to ground, famous for tenacity well beyond its size.
Bold, intelligent, and endlessly energetic, Jack Russells need real daily activity and mental engagement to stay content.
