smart: i have a four month old female mini doxie. when will she reach maximum physical maturity? just curious.When will my mini doxie reach its weight and size maturity?Doxies reach their adult size at about 8-9 months, and they are also close to their adult weight at that time, but may continue to put on just a bit more until they are about a year old or so. They will continue to "fill out" for a few months after that, gaining a more "mature" appearance, but they won't really gain extra weight or grow bigger.When will my mini doxie reach its weight and size maturity?You should ask your breeder, she should know better than people here how big your dog should be at this point, and when she will be physically mature.