When Will My Golden Retriever Be Full Grown. Variation of Growth in Golden Retriever Types. Starting at around six months old and continuing until as late as sixteen months Golden Retrievers will grow to their full size and if they have not been neutered they will reach sexual maturity and start entering heat cycles and displaying mating behavior.
Remember that there are wide variations in size within the Golden Retriever breed. Your puppy will reach her full height between 9 to 12 months of age but shell only fill out by 18 months. The Golden Retriever classifies as a gundog breed.
This doesnt mean all golden retrievers will become calmer at this stage.
3 Weeks 12 Weeks Socialization. At What Age are Golden Retrievers Fully Grown. Full-grown male golden retrievers on average weigh 65-75 pounds and are 23-24 inches tall. Typically it will take approximately 18 months for your Golden Retriever to become an adult dog.
