Electric fences stop 97% of attacks by wolves on livestock according to this article from EFE. In an experiment in 30 sheep farms in Spain, only three attacks occurred with the death of just one sheep during a year. Mastiffs are effective, though less so, with a 69% reduction in livestock injuries and deaths. The results were presented at the meeting Conviviendo con el lobo: Prevención de daños en Europa Meridional held in Segovia this February.
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