Thank you macgro7 for telling us about that tradition. I wish we knew so much more about how things are done in different countries, different climates, different economic situations, various degrees of mountain-ness or plains, salt flats, and so on. I think when it's something which is always done in your country you just tend to take it for granted and not tell anyone else about it.
Various countries have the tradition of transhumance, although in places such as the Pyrenees I believe they transport the sheep to the high pastures, or at least to the lower slopes, by lorry nowadays as the old drove roads are gone. It would be such a shame if customs such as these were lost. Imagine cheese made from milk produced in sunny summer Alpine pastures
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We used to have a sheep guardian dog cross - Anatolian Karabash - so perhaps similar to your Tatra, and I have seen the French version working in the Auvergne. I always wondered how a single dog could protect a flock from a whole pack of wolves, so good to know for transhumance they use several.
In fact in Britain there are some 'close shepherded' flocks which are taken back to in-bye land at night, for example Hebrideans in Ashdown Forest.