Русско-английский словарь пословиц и поговорок
ОДНА ЛАЮЩАЯ СОБАКА ВСПОЛОШИЛА ВСЮ УЛИЦУ
It takes one man to start a rumo(u)r, and all the people around will talk
Cf:One barking dog sets all the street a-barking (Br.). One dog barks at nothing; the rest bark at him (Am.). When one dog barks, another at once barks too (Br.)