In-depth guide · Growth
How big will my puppy get? What real growth data shows
How to estimate your puppy’s adult weight from its weight, age and size class, with honest ranges, a worked example and why calculators disagree.
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Growth
How big puppies and kittens get, how fast, and how sure anyone can be — read from the open data behind the best-known growth charts, with the folk rules measured against it.
Growth guides
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Guide · Growth
Double at 16 weeks? Puppy weight rules tested on real data
Six popular puppy weight rules tested size by size on U.S. vet-visit data: how far each one misses, how often it lands within 10%, and what to use instead.
Guide · Growth
Kitten weight by week: what the growth data shows
Typical kitten weights by week for females and males from U.S. vet data, how fast kittens gain, when they finish growing and when to call your vet.
Guide · Growth
Mixed-breed puppy size: parents, DNA tests and paw myths
How to estimate a mixed-breed puppy’s adult size from its own weight and age, what parents and DNA tests can add, and what paw size can’t tell you.
Guide · Growth
When do puppies stop growing? Ages by adult size
When puppies finish growing, by adult size: three sources side by side, the ages at 90% and 95% of adult weight, and what a 7-month-old has left.