أَعُوْذُ بِاللَّهِ مِنَ الشَّيْطَانِ الرَّجِيـمِ

A'oodhu billaahi minash-Shaytaanir-rajeem

I seek refuge in Allah from Satan the outcast. Also "If you hear the barking of dogs or the braying of asses at night, seek refuge in Allah for they see what you do not." [1]

Reference: Sahih. Abu Dawud: 5103