Wondering how big your Old English Sheepdog puppy will get? Use the calculator below: enter your puppy’s age and current weight to see a personalized growth curve and an adult weight estimate.
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 Old English Sheepdog is a large breed. Adult males typically weigh 70–90 lb (31.8–40.8 kg) and females 60–80 lb (27.2–36.3 kg). Most Old English Sheepdogs reach about half their adult weight around 4.5 months, hit 90% by roughly 9.9 months, and are fully grown near 16 months. Large breeds keep growing well past their first birthday, mostly filling out in the chest.
When do Old English Sheepdogs stop growing?
Most Old English Sheepdogs reach their full adult height and weight by about 16 months. Growth is fastest before 4.5 months, then slows steadily — by 9.9 months your puppy will be about 90% of its final size.
How much should a Old English Sheepdog puppy weigh at 4 months?
A typical 4-month-old Old English Sheepdog weighs roughly 29–37 lb, about 44% of its adult weight. Use the calculator above with your puppy’s exact weight for a personalized estimate — individual dogs vary.