Of course, you will get a better sense of size by looking at the actual parents of your pup, and averaging their weight and height. (wileypup.com)
Confusing matters even more, it's difficult to prove if the parents listed on the registration paper are even the actual parents of the pup in question. (dogs.lovetoknow.com)
Don't buy any pup unless you are dealing directly with the breeder and are able to see both the parents of the pups and get all the paperwork BEFORE you pass over the money.. (bordercollierescue.org)