As Jack said, calling the correct weight is huge. Personally, I think it is the foundation to the 'winning' dog. Lots of dogs have a two pound window in which they can perform admirably, some even three. It is simply hard for a really good dog who is smaller to beat a really good dog who is bigger. Calling weight is an art. Lots of times it is the difference between winning and losing when really good dogs are involved.

EWO