Use this Sealyham Terrier puppy weight calculator to predict how big your puppy will get. Sealyham Terriers are a terrier breed that typically reach full size by around 12-15 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.
A practical pick for medium-sized breeds.
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| Age | Weight |
|---|---|
| Birth | 0.5 to 1 lbs |
| 2 Months | 3 to 5 lbs |
| 3 Months | 6 to 7 lbs |
| 4 Months | 8 to 10 lbs |
| 5 Months | 10 to 12 lbs |
| 6 Months | 13 to 14 lbs |
| 7 Months | 15 to 17 lbs |
| 9 Months | 17 to 19 lbs |
| 10 Months | 20 to 22 lbs |
| 1 Year | 22 to 24 lbs |
| 1.5 Years | 23 to 24 lbs |
| 2 Years | 23 to 24 lbs |
Estimated from typical medium-breed growth curves and the Sealyham 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.
Generally a healthy breed; some eye conditions and patellar luxation can occur.
A quality diet in measured portions; standard weight management applies.
The wiry double coat needs regular brushing and periodic hand-stripping.
Sturdy and outgoing — consistent, engaging training suits this breed, which is calmer than many smaller terriers.
A Welsh terrier developed in the 1800s to hunt badger, otter, and fox, recognizable by its distinctive "fall" of hair over the forehead.
Brave and spirited but calmer than many terriers, Sealyhams have a genuinely sly sense of humor that fans appreciate.
