No, no. By introducing fresh blood we dont create a new breed. It is something that should be done now and then in every breed. Try to understand what a dog-breed is. It is NOT a separate species - only a variety of a species. To develop and conserve a breed is all a matter of testing, selecting, testing, selecting, testing, selecting...........The pedigrees and the heritages are not goldstandards - as genetic variation may drift you off anyway.
Please read "the backcross project" by Joanne Nash. You find the article on
http://www.canice-genetics.com (scroll down to the article.)
fenris