At what age do dogs
Bailey Schuster
2025-08-03 17:51:49
Count answers
: 10
The age at which your puppy becomes an adult dog will depend on its breed and size.
All breeds are categorised into five sizes of dog: x-small, small, medium, large and giant.
Your puppy will become an adult dog at the following ages: X-small breed (4kg): eight months
Small breed (5 - 10 kg): 10 months
Medium breed (11 - 25kg): 12 months
Large breed (26 - 44kg): 15 months
Giant breed (45kg and up): 18 to 24 months.
The different classifications of when your puppy is an ‘adult dog’ are due to the length of the growth phase for different-sized breeds; large and giant dogs take a lot longer to fully mature than smaller dogs, although all of them have an intense growth spurt.