The age at which a dog is fully grown can vary depending on their breed and size. u003cbru003eu003cbru003eSmaller dog breeds typically reach their full adult size and weight between 10-12 months of age, while larger breeds may take 12-24 months or more to fully mature. u003cbru003eu003cbru003eSome of the largest breeds, such as Great Danes or Mastiffs, may not reach their full adult size until they are 2-3 years old.u003cbru003eu003cbru003eIt's important to note that while a dog may be fully grown in terms of physical size and weight, it may continue to develop and mature mentally and behaviorally over time. u003cbru003eu003cbru003eTraining and socialization are important components of a dog's overall development and can help ensure that they grow into a well-behaved, balanced adult dog. u003cbru003eu003cbru003eRegular veterinary check-ups can also help monitor a dog's growth and ensure that they are healthy and developing appropriately.