Hi Samy! Thanks for your answer. I was thinking of buying such a device, but according to reviews I have read it is not always effective against an aggressive big dog. It is more useful as training tool for your own dog. As I have grown in countryside I frequently encountered dogs when cycling or riding, so it is not a problem to face one or two dogs even if they are aggressive (if is kangal even one would be a problem  ). I would like to avoid though any routes where many herds of sheeps are kept. It is a rule I have followed also in Greece as herd dogs are kept in packs and are really wild and aggressive especially at mountain areas, where they fight wolves frequently.
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