Maybe before studding your dog out you should find out if he is KC reg as you have asked how to find out. Plus have his health checks done - what are the major health problems with CKCS??? I am not familiar with the breeds health issues and checks. Also please check the bitch out and ask the relevant questions of the owners before letting your family pet mate her. Studding out your dog is not to be taken lightly - please make sure you are doing the right thing.