Every Welsh Terrier grows at its own pace. Enter your puppy’s age and weight below to see where it sits on the breed’s growth curve and what adult size to expect.
Estimates combine your puppy’s current trajectory with typical growth curves for this breed and size class. Individual dogs vary — nutrition, genetics and neuter timing all matter. For health concerns, ask your vet.
The Welsh Terrier is a small breed. Adult males typically weigh 20–22 lb (9.1–10.0 kg) and females 18–20 lb (8.2–9.1 kg). Most Welsh Terriers reach about half their adult weight around 3.8 months, hit 90% by roughly 7.9 months, and are fully grown near 11 months. Small breeds do the bulk of their growing in the first six months, then fill out slowly.
When do Welsh Terriers stop growing?
Most Welsh Terriers reach their full adult height and weight by about 11 months. Growth is fastest before 3.8 months, then slows steadily — by 7.9 months your puppy will be about 90% of its final size.
How much should a Welsh Terrier puppy weigh at 4 months?
A typical 4-month-old Welsh Terrier weighs roughly 10–11 lb, about 53% of its adult weight. Use the calculator above with your puppy’s exact weight for a personalized estimate — individual dogs vary.