A very valuable piece of information; thank you; it sums it up nicely; it also confirms my understanding that there are varying types and strains; however, I don't think that the response fully addresses the post, as a question is about both the physical and temperament differences between CAS types and strains.
To start and without being fussy, does Type = Strain? I am just trying to narrow the discussion as much as possible, and as a dog owner not a breeder, I am really eager to learn and don't mind being spoon fed :)
The most interesting part in your response for me is that there are still some countries that focus on dogs that are bred for work, and not for show; thank God for that :) Applying the rule of elimination from what you said, these countries are: Afghanistan, Pakistan, Iran, Uzbekistan, Tajikistan and Kyrgystan.
Having said that, I believe that the Russian CAS produced by the late Red Star Kennel was very successful in producing exceptional quality of guard CAS; where they also exceptional as shepherds; I wonder what happened to the Red Start Kennel, who inherited their breeding stock, and again what are physical and temperament differences between the Russian CAS and the rest?
The more I think about it, the more I realise how large the topic is .. So, if you may please allow me, I will come back to where I started:
What are the physical differences between the different types? How can the different types be identified? What are the different traits between the different types? What do different types of CAS excel in over the other?
Perhaps, it might be easier, as a starting point, to classifying CAS according to their terrain: Mountain Type, Steppe Type and Desert Type - And build up from there ..
Thank you for your time, and I would like to take the opportunity to wish you a Blessed Festive Season and a Happy 2020 :)