Diet and exercise will not play a role in adult size near as much as genetics. You really have to know the line of the pup to even come close. Even then your pup could end up the smaller of the line, or the largest. Growth rates won't really tell you much either. You could have an early bloomer, or late bloomer. The closet I've seen to accurate estimate of adult size is double their weight at 12 weeks, and add 1 lb. Or double 14 week old weight. That should get you fairly close.
Diet and exercise is very important. But your pups frame will not be considerably effected by it. It will determine a healthy, or unhealthy weight for their frame. 9 to 12 months of age, your pups growth plates will be closed, and his/her frame (height/length) complete. Significant growth is slowed around 6 months of age.
Puppies growing too fast?
I'm actually raising my first "raw fed litter" and they're growing like weeds. While we presume Dad was a yorkie (mom was a rescue who lived outside with other dogs) I really have no idea how big they are "supposed" to be; so I am just offering 4 raw meals a day; whatever they can consume in 10 minutes. The bone meal obviously takes them longer; but I let them gauge how much they need. The most important thing I think is just to weigh them regularly so that you can really track their progress. This is the guide I've been using and I think it's incredible.
Rubia -y mi perrito que Rico
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