Use this Boston Terrier puppy weight calculator to predict how big your puppy will get. Boston Terriers are a small breed that typically reaches full size by around 9-12 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 | 3 to 8 lbs |
| 3 Months | 4 to 10 lbs |
| 4 Months | 5 to 13 lbs |
| 5 Months | 7 to 15 lbs |
| 6 Months | 8 to 18 lbs |
| 7 Months | 9 to 20 lbs |
| 9 Months | 10 to 23 lbs |
| 10 Months | 11 to 25 lbs |
| 1 Year | 12 to 25 lbs |
| 1.5 Years | 12 to 25 lbs |
| 2 Years | 12 to 25 lbs |
Estimated from typical toy-breed growth curves and the Boston 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.
As a brachycephalic breed, Bostons can experience breathing difficulty, especially in heat, and are prone to eye issues (their prominent eyes are at higher risk of injury and corneal ulcers) given their flat face and shallow eye sockets.
A quality small-breed diet in measured portions; keeping weight in check reduces strain on breathing.
The short, smooth coat needs minimal grooming — an easy-care breed overall.
Intelligent and eager to please, Bostons train well with positive reinforcement and generally do well in apartments given their moderate exercise needs.
The Boston Terrier is one of the few breeds developed entirely in the United States, created in 1800s Boston by crossing English Bulldogs with English Terriers, then refining the type through selective breeding. Nicknamed "the American Gentleman" for its tuxedo-like black-and-white coat, it was the first US breed admitted to the AKC's Non-Sporting Group, in 1893.
The standard calls for a friendly, lively dog with excellent disposition and high intelligence — Bostons were bred purely as companions from the start, with none of the working-dog drive some other terrier-descended breeds carry.
