Caroline. It is fact that ALL pedigree dogs were created by man by only allowing small gene pools. He bred the dogs to the standards he wanted by selective inbreeding and over the generations they evolved into the different breeds. It is ironic that some of the guys who did this were deeply religious and did not believe in evolution whilst they actually proved the principle by their own actions.
Re man evolving from primates this goes back millions of years and it is possible that the present day primates followed a different course of evolution and possibly came from a different origin or branch of the tree. There is a theory that there were many different lines of ape-like creatures and they inter bred to form more humanlike beings....for example Homo Erectus type creatures and Homo Sapiens intermated with Neanderthals. Here is an article explaining this theory.