Good looking pup.
Be sure to feed her a good food, as quality affects their growth.
If legs seem to be growing too fast, buy some Osteoform supplement that helps growth. It is a powder to put in the food.
Oh and once she gains her balance she will have no trouble breaking free or pulling that frame out of concrete. Seen it happen more than once, with pups just eight months old.
Recommend a tire axle and chain for outdoors. Axles cost like $10 at a junkyard and are not breakable, and will not be pulled out of the ground. Chain should be no longer than 12 feet.
It is with our judgments, as with our watches; no two go just alike, yet each believes his own.