When Do Dogs Reach Puberty. Dog puberty usually occurs when your pup is between 7 months and 2 years old and as with humans, it can bring a whole load of behavioural and physical changes. It’s one of the first ways a puppy discovers its own strength and social standing.
Generally speaking, puppies will start to mature sexually between 7 and 10 months of age. Some animals, like the cabrera’s hutia (a rodent that lives in cuba), reach this point when they get to an exact weight of 360g for females, or 300g for males. The first physical signs you tend to see are a degree of swelling or redness of the vulva, a small amount of clear discharge and some increased licking of the area.