Question

What the percent of a puppy that weighs 2 pounds at birth and 5 pounds when one month

Answer 1

Generally, most puppies fit into five dog breed sizes. Your smallest dogs are the toy dog breeds. Then there are the small, medium, and large sizes of dogs. Your largest breeds of dogs fall into the giant sizes.  

Toy =  up to 12 lbs

Small = 12 - 25 lbs

Medium = 25 - 50 lbs

Large = 50 - 100 lbs

Giant = Over 100 lbs

If you want to document your own puppy's development, then you might want to look at this journal - Puppy's First Year Keepsake Book.  

Apart from documenting many other milestones, it has a nice chart where you can document your own puppy's growth and weight.