When Will My French Bulldog Be Full Grown. However it will reach its maximum height and length between the ages of 9 and 15 months. 152020 While it takes about two years for a French bulldog to fully mature and fill-in they usually reach their full size between the ages of nine and twelve months old.

One thing to keep in mind is that their size is determined by the height of the withers and the length from the base of their neck to their buttocks. Any increase in size from this point can be attributed to the development of muscle. French bulldogs may reach maturity faster but they age slower than English bulldogs.
At what age is a bulldog full grown.
There are even dogs who have reached adult. As short dogs French Bulldogs barely double in height from three months of age to 1 year old. For example if your pup is 10-weeks old and weighs 25 lbs then follow that column down to the 12-month. 152020 While it takes about two years for a French bulldog to fully mature and fill-in they usually reach their full size between the ages of nine and twelve months old.