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you don’t see Shi Tzus reverting back to wolves either “
dogs are a good starting point since there are so many divers breeds which are all of the same species.
I have heard (from a dog expert) that when dogs of different breeds are allowed to inter-mate the result after a few generations is predictable. some sort of generic uniform dog results almost regardless of the mix started with, provided you have enough variation. they do not become wolves or foxes or coyotes. I am not making any point with this or any argument in the discussion. it is just an interesting fact. (if true).