It is narrated about an Aslami companion (may Allah be pleased with him) that he was bitten by an animal. This was mentioned to the Prophet Muhammad (peace be upon him), so he (peace be upon him) said: "If you had recited these words in the evening: 'A'udhu bikalimatillahi-t-tammati kulliha min sharri ma khalaq' (I seek refuge in all the perfect words of Allah from the evil of what He has created), then nothing would have harmed you until the morning." The narrator of the hadith, Suhail, says that if any of us was bitten by an animal, my father would ask, "Did you recite these words?" If he replied, "Yes," then his opinion would be that now nothing would harm him.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23650
Hadith Gradingحکم دارالسلام:حديث صحيح، وقد اختلف عن سهيل بن أبى صالح فى صحابي هذا الحديث
It is narrated from a Companion (may Allah be pleased with him) that soon the world will be dominated by the most despicable of the despicable, and the best person is that Muslim who is between two honorable things.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23651