
If you look in any schedule you nwill find a definition of the classes which will tell you what the classes mean.
As for stud book qualification this is different for diferent breeds and the breeds are aranged in bands as to which wins qualify for stud bok entry.
In my own breed only the CC, RCC winners and 1st and 2nd in Open at a champ show wehre CCs are on offer for the bred counts, as well as a dog that wins a Junior Warrant.