‏اللباس والزينة‏ : Hadeeth No:5283 Jabir reported that there happened to pass before Allaah's Prophet (sallAllaahu alayhi wa sallam) an ass the face of which had been cauterised, whereupon he said: Allaah has cursed one who has cauterised it (on the face)....

‏الصلاة : Hadeeth No:1037 'Urwa b. Zubair reported: 'A'isha asked: What disrupts the prayer? We said: The woman and the ass. Upon this she remarked: Is the woman an ugly animal? I lay in front of the Messenger of Allaah (sallAllaahu alayhi wa sallam) like the bier of a corpse and he said prayer....