This is what I suspect. I am still waiting for the pedigree certificate. I almost forgot about it. I hope to be able to get hold of the breeder and have a chat with her soon. She is the busy bee who brought the first CAO with her from Russia to Australia. Although the terms CAS and CAO are used interchangeably. I like to believe that Tzar was a true CAO, whilst Tzarina is a true CAS ...